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 a/b = c/d, what is the cross-multiplication method?

Back

The cross-multiplication method states that a*d = b*c.

Front

Solve the proportion: 2/3 = x/12

Back

x = 8.

Front

What is the first step in solving a proportion?

Back

Identify the two ratios that are being compared.

Front

If Hunter buys 36 baseball cards for $18, how many baseball cards can Troy buy if he has $9?

Back

Troy can buy 18 baseball cards.

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: 4/x = 2/8

Back

x = 16.

Front

What is the relationship between the means and extremes in a proportion?

Back

In a proportion, the product of the means equals the product of the extremes.

Front

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

Back

x = 10.