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 variable.

Front

If 4/5 = x/20, what is x?

Back

x = 16

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

If I have 3 apples for every 2 oranges, how many apples do I have if I have 10 oranges?

Back

I have 15 apples.

Front

What is the formula for finding a missing value in a proportion?

Back

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

Front

If 2/3 = x/12, what is x?

Back

x = 8

Front

What does it mean if two ratios are equivalent?

Back

It means that they represent the same relationship between quantities.

Front

If I can make 4 cookies with 2 cups of sugar, how many cookies can I make with 10 cups of sugar?

Back

I can make 20 cookies.

Front

What is the first step in solving a proportion?

Back

Identify the two ratios that are being compared.