Imagine that you have a great recipe for cheese dip but it only serves four people. You are having a party and twenty people will be at the party. How can you adjust a recipe that serves four people so that it will serve twenty people? This is one example on how proportions can be used to solve everyday problems.

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## What are proportions?

A proportion is a math equation that demonstrates that two ratios are equivalent. Understanding what a proportion is can help you find missing values in a math problem. Proportions can help people increase a cheese dip recipe in order to feed a large group of people at a party. They are used to enlarging or reduce the sizes of pictures and a variety of other things. Proportions are usually written as equivalent ratios (fractions). They can be represented in tables and graphs as well.

Examples of proportions

## Tests for proportions

Ratios can be tested to see if they form proportions.

- You can use a common denominator if the ratios are written as fractions.
- You can check to see if the cross products are the same if the ratios are written as fractions.
- You can determine if the ratios are equivalent if they are changed to decimals.

## Types of Proportion Problems

Here are some examples of proportion problems that you might see in middle school math.

## Proportion Tables

Proportions are better understood if the numbers are written in tables. Look at these tables. Take notice of patterns in each table and the similarities of the tables.

## Video Tutorials

For online tutoring and check out my interactive math classes on Outschool.