Solving 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 36 baseball cards cost $18, how much does each card cost?

Back

Each baseball card costs $0.50.

Front

If Troy has $9, how many baseball cards can he buy if each costs $0.50?

Back

Troy can buy 18 baseball cards.

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

Solve the proportion: 3/4 = x/12. What is x?

Back

x = 9.

Front

What is the first step in solving a proportion?

Back

The first step is to set the two ratios equal to each other.

Front

If a recipe calls for 2 cups of flour for 3 servings, how much flour is needed for 9 servings?

Back

You need 6 cups of flour.

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities.

Front

Solve the proportion: 5/x = 15/3. What is x?

Back

x = 1.