Ratio To Percent - Math Steps, Examples & Questions

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Ratio to percent

Here you will learn about ratio to percent, including how to convert from ratios to percents and how to solve word problems involving converting ratios to percents.

Students will first learn about ratio to percent as part of ratio and proportion in $6$ th grade.

What is ratio to percent?

Ratio to percent is when you use a given ratio to calculate a percent.

A ratio tells us how much there is of one thing in relation to another thing.

For example, if Olivia and Dean share some sweets in the ratio $3:2,$ then for every $3$ sweets Olivia gets, Dean gets $2.$ You can use this information to write the percent of sweets Olivia and Dean each get.

To find the percent of sweets they each get, first convert the ratio into fractions.

The ratio $3:2$ has $5$ parts, so the fractions are

$\cfrac{3}{5} : \cfrac{2}{5}$

The numerator represents the numbers of the ratio, which show how many sweets Olivia and Dean each get. The denominator represents the total number of sweets that are present in the ratio. So out of every $5$ sweets, Olivia gets $3$ and Dean gets $5.$

Olivia gets three-fifths of the sweets and Dean gets two-fifths. You can convert these fractions to percents.

You may be able to recognize what the fractions are as percents or you may need to use long division to help convert your fractions.

$\cfrac{3}{5}=60 \%,$ so Olivia gets $60 \%$ of the sweets.

$\cfrac{2}{5}=40 \%,$ so Dean gets $40 \%$ of the sweets.

Each percent must include the percent sign $\%$ (also known as percent symbol or percentage symbol).

What is ratio to percent?

Common Core State Standards

How does this relate to $6$ th grade math?

Grade 6 – Ratio and Proportional Relationships (6.RP.A.3c)
Find a percent of a quantity as a rate per $100$ (for example, $30 \%$ of a quantity means $\cfrac {30}{100}$ times the quantity); solve problems involving finding the whole, given a part and the percent.

How to convert a ratio to a percent

In order to convert a ratio to a percent:

Add the parts of the ratio for the denominator of the fractions.
Convert each part of the ratio to a fraction.
Convert the fractions to percents.

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Ratio to percent examples

Example 1: converting a two part ratio to percents

The ratio of blue counters to red counters is $3:1.$ Write the ratio as percents.

Add the parts of the ratio for the denominator of the fractions.

$3 + 1 = 4.$ There are $4$ parts in total. The denominator is $4.$

2Convert each part of the ratio to a fraction.

$3:1$ becomes $\cfrac{3}{4}:\cfrac{1}{4} \, .$

3Convert the fractions to percents.

$\cfrac{3}{4}$ and $\cfrac{1}{4} \,$ are common fractions for which you should already know the percent conversions.

$\cfrac{3}{4} : \cfrac{1}{4}=75 \% : 25 \%$

Example 2: converting a two part ratio to percents

The ratio of green counters to yellow counters is $3:5.$ What percent of the counters are green?

Add the parts of the ratio for the denominator of the fractions.

$3 + 5 = 8.$ There are $8$ parts in total. The denominator is $8.$

Convert each part of the ratio to a fraction.

$3:5$ becomes $\cfrac{3}{8}:\cfrac{5}{8} \, .$

Convert the fractions to percents.

$3 \div 8=0.375$

$5 \div 8=0.625$

$0.375=37.5 \%$ and $0.625=62.5 \%$ therefore,

$\cfrac{3}{8}:\cfrac{5}{8}=37.5 \% : 62.5 \%.$

Order is important in ratios, and in this ratio, the number of green counters is first.

Therefore the percent of counters that are green is $37.5 \%.$

Example 3: converting a three part ratio to percents

A garden center sells three types of bulbs; daffodil, tulip and lily, in the ratio $6:9:5.$ What percent of the bulbs sold are tulips?

Add the parts of the ratio for the denominator of the fractions.

$6 + 9 + 5 = 20.$ There are $20$ parts in total. The denominator is $20.$

Convert each part of the ratio to a fraction.

$6:9:5$ becomes $\cfrac{6}{20}:\cfrac{9}{20}:\cfrac{5}{20} \, .$

Convert the fractions to percents.

Writing each fraction with a denominator of $100,$

$\cfrac{6}{20}:\cfrac{9}{20}:\cfrac{5}{20}=\cfrac{30}{100}:\cfrac{45}{100}:\cfrac{25}{100}.$

$\cfrac{6}{20}:\cfrac{9}{20}:\cfrac{5}{20}=30 \% : 45 \% : 25 \%$

This question asks about the number of tulips sold, which is the middle value. The percent that are tulips is $45 \%.$

Example 4: solving a problem involving ratio to percents

In April $2022,$ Ben and Jacob shared some money in the ratio of their ages. Ben was born in June $2014$ and Jacob in January $2019.$ What percent of the money does Ben receive?

Add the parts of the ratio for the denominator of the fractions.

In April $2022,$ Ben is $7$ and Jacob is $3.$ The ratio of their ages is $7:3.$

$7+3=10.$ There are $10$ parts in total. The denominator is $10.$

Convert each part of the ratio to a fraction.

$7:3$ becomes $\cfrac{7}{10}:\cfrac{3}{10} \, .$

Convert the fractions to percents.

$\cfrac{7}{10} :\cfrac{3}{10} = 70 \% : 30 \%$

Ben receives $70 \%$ of the money.

Example 5: solving a problem involving ratio to percents

The ratio of adults to children in a park is $6:4.$

One-third of the adults are men. What percent of the people in the park are women?

Add the parts of the ratio for the denominator of the fractions.

$6 + 4 = 10.$ There are $10$ parts in total. The denominator is $10.$

Convert each part of the ratio to a fraction.

$6:4$ becomes $\cfrac{6}{10}:\cfrac{4}{10} \, .$

Convert the fractions to percents.

$\cfrac{6}{10} : \cfrac{4}{10} = 60 \% : 40 \%$

You now know that $60 \%$ of the people are adults.

One-third of the adults are men.

$\cfrac{1}{3} \,$ of $\, 60 \% = 20 \%$

$20 \%$ of the people in the park are men, and therefore $60-20=40 \%$ of the people are women.

Example 6: solving a two-step word problem involving ratio to percents

William and Matthew share some money in the ratio $3:7.$ Matthew gives two-fifths of his money to Ellie. Who receives the most money?

Add the parts of the ratio for the denominator of the fractions.

$3 + 7 = 10.$ There are $10$ parts in total. The denominator is $10.$

Convert each part of the ratio to a fraction.

$3:7$ becomes $\cfrac{3}{10}:\cfrac{7}{10} \, .$

Convert the fractions to percents.

$\cfrac{3}{10} : \cfrac{7}{10} = 30 \% : 70 \%$

Now you know that William receives $30 \%$ and Matthew receives $70 \%.$ Matthew gives two-fifths of his money to Ellie. So you need to find two-fifths of $70 \%.$

$\cfrac{2}{5} \,$ of $\, 70 \% = \cfrac{2}{5} \times \cfrac{70}{1}=\cfrac{140}{5}$

$\cfrac{140}{5}=28 \%$

Matthew gave Ellie $28 \%.$

Subtract to find what percent Matthew has left.

$70 \% - 28 \%=42 \%$

The question asks who receives the most money – William, Matthew, or Ellie.

William has $30 \%,$ Matthew has $42 \%,$ and Ellie has $28 \%.$

Matthew receives the most money.

Teaching tips for ratio to percent

Start by explaining the concept of ratios and percents using familiar situations that students can relate to. For example, you can talk about how a recipe uses a ratio of ingredients, and then show how to convert those ratios into percentages for easier understanding. Another example is to create ratios using the number of students in your classroom.

Instead of just providing study materials, utilize educational apps or online tools that allow students to practice converting ratios to percents interactively, such as a percentage calculator or a ratio calculator. This adds a modern and engaging dimension to the learning process.

Give students a worksheet with solved examples and ask them to work backward to find the starting ratio. Students can calculate the ratio given the fractional form or percentage value first.

For students who are struggling with ratio to percentage conversions, give them activities with commonly used ratios and provide a percentage table to use. Ask them to explain why the original ratio and percentage both represent the relationship. Then model how to convert the ratio to a percentage. With time, students can begin to identify the relationships and solve calculations on their own.

Easy mistakes to make

Confusing ratios and fractions
For example, the ratio $2:3$ is expressed as the fraction $\cfrac{2}{3}$ and not $\cfrac{2}{5} \, .$
This is a misunderstanding of the sum of the parts of the ratio. Be careful with what the question is asking as the denominator may be the part or the whole amount.

Writing the ratio in the wrong order
Order is important in ratio questions and you must maintain the original order throughout your work and answer.

Ratio
Unit rate math
Simplifying ratios
Ratio to fraction
How to calculate exchange rates
Ratio problem solving
How to write a ratio
Dividing ratios
How to find the unit rate
Ratio scale
Constant of proportionality

Practice ratio to percent questions

80 \% : 20 \%

10 \% : 40 \%

20 \% : 80 \%

40 \% : 10 \%

This ratio has $5$ parts in total, therefore

$1:4=\cfrac{1}{5}:\cfrac{4}{5} \, .$

Converting to percents,

$\cfrac{1}{5}:\cfrac{4}{5}=20 \% : 80 \% \, .$

9 \%

90 \%

55 \%

45 \%

This ratio has $20$ parts, therefore

$9:11=\cfrac{9}{20}:\cfrac{11}{20} \, .$

Converting to percents,

$\cfrac{9}{20}:\cfrac{11}{20}=45 \% : 55 \% \, .$

$45 \%$ of podcast subscribers are men.

87.5 \%

70 \%

10 \%

12.5 \%

The total number of parts in this ratio is $8,$ therefore

$1:7=\cfrac{1}{8}:\cfrac{7}{8} \, .$

Converting to percents,

$\cfrac{1}{8}:\cfrac{7}{8}=12.5 \% : 87.5 \% \, .$

$87.5 \%$ of those on the trip are students.

24 \%

55 \%

11 \%

44 \%

The total number of parts in this ratio is $25,$ therefore

$11:8:6=\cfrac{11}{25}:\cfrac{8}{25}:\cfrac{6}{25} \, .$

Converting to percents,

$\cfrac{11}{25}:\cfrac{8}{25}:\cfrac{6}{25}=44 \% : 32 \% : 24 \% \, .$

Sam gets $44 \%$ of the sweets.

70 \%

14 \%

30 \%

20 \%

The total number of parts in this ratio is $10,$ therefore

$7:3=\cfrac{7}{10}:\cfrac{3}{10} \, .$

Converting to percents,

$\cfrac{7}{10}:\cfrac{3}{10}=70 \% : 30 \% \, .$

$70 \%$ of the olympiad team are boys and one-fifth of the boys wear glasses.

$\cfrac{1}{5}$ of $70 \% = 14 \%$

$14 \%$ of the olympiad team are boys who wear glasses.

5.75 \%

11.5 \%

23 \%

46 \%

The total number of parts in this ratio is $50,$ therefore

$23:27=\cfrac{23}{50}:\cfrac{27}{50} \, .$

Converting to percents,

$\cfrac{23}{50}:\cfrac{27}{50}=46 \% : 54 \% \, .$

Anne gets $46 \%$ of the money and gives one quarter of her share to James.

$\cfrac{1}{4} \,$ of $\, 46 \% = 11.5 \%$

James gets $11.5 \%$ of the money.

Ratio to percent FAQs

How do you convert ratios to percents?

To convert ratios to percents, first add the parts of the ratio to get the denominator of the fractions, then convert each part of the ratio to a fraction. Finally, convert the fractions to percents.

How can you convert a ratio to a percent using a percentage formula?

The formula for converting a ratio to a percentage is: $Percentage = (Numerator \div Denominator) \times 100.$ Note that this is used for a part-whole ratio.

How do you simplify a ratio?

To simplify a ratio, you divide both numbers in the ratio by their greatest common factor.

How is a percent similar to a ratio?

A percent is a specific type of ratio where the whole is represented as $100.$ A ratio can be converted into a percent or you can use percentage increase and percentage decrease to solve ratio problems.

Can ratios only be represented by whole numbers?

No, ratios can involve any type of numbers, including decimals and fractions, as long as they represent the relationship between the quantities being compared.

The next lessons are

Proportion
Converting fractions, decimals and percentages
Percent

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