Solve 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 two ratios and set the products equal to each other.

Front

If 3 pounds of hamburger costs $6, how much does 1 pound cost?

Back

$2 per pound.

Front

Alicia buys 10 pounds of hamburger at $2 per pound. How much does she pay?

Back

$20.

Front

What is the ratio of cats to dogs if there are 3 cats for every 5 dogs?

Back

The ratio is 3:5.

Front

If there are 25 dogs in the shelter, how many cats are there if the ratio is 3:5?

Back

15 cats.

Front

If there are 5 ice cream cones for every 3 brownies, how many cones are sold if 24 brownies are sold?

Back

40 ice cream cones.

Front

What is the relationship between the number of ice cream cones and brownies sold?

Back

The relationship is a ratio of 5:3.

Front

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

Back

24 weeks.

Front

What is the ratio of oatmeal cookies to chocolate chip cookies if there are 5 oatmeal and 6 chocolate chip cookies?

Back

5:6.