Proportions

Front

What is a proportion?

Back

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

Front

What does it mean to cross multiply in proportions?

Back

Cross multiplying involves multiplying the numerator of one ratio by the denominator of the other ratio to find a common value.

Front

If 3/4 = x/16, what is x?

Back

x = 12.

Front

How do you determine if two ratios form a proportion?

Back

Two ratios form a proportion if their cross products are equal.

Front

What is the formula to find a missing value in a proportion?

Back

If a/b = c/d, then ad = bc.

Front

If 5/10 = x/20, what is x?

Back

x = 10.

Front

What is the relationship between equivalent ratios and proportions?

Back

Equivalent ratios are ratios that express the same relationship and can be used to form proportions.

Front

How can you write a proportion to find how many points a student needs to score on a test worth 12 points to achieve 75%?

Back

p/12 = 75/100.

Front

What is the first step in solving a proportion?

Back

The first step is to cross multiply.

Front

If 2/3 = 4/x, what is x?

Back

x = 6.