Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then solve for the unknown variable.

Front

If a car travels 50 miles in 40 minutes, how far does it travel in 20 minutes?

Back

25 miles

Front

What is the ratio of sugar to flour in a recipe that calls for 10:3?

Back

The ratio of sugar to flour is 10:3.

Front

If you have 50 ounces of sugar, how many ounces of flour do you need if the ratio is 10:3?

Back

15 ounces of flour.

Front

What is the unit rate of a car traveling 50 miles in 40 minutes?

Back

The unit rate is 1.25 miles per minute.

Front

If a 12-ounce bottle of shampoo lasts 16 weeks, how long will an 18-ounce bottle last?

Back

24 weeks.

Front

What is the first step in solving a proportion?

Back

Identify the two ratios that are being compared.

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities.

Front

How can you check if two ratios are equivalent?

Back

Cross-multiply and see if the products are equal.