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

What is the first step in solving the proportion 2/x = 4/8?

Back

Cross-multiply to get 2 * 8 = 4 * x.

Front

Solve the proportion: 3/x = 6/12.

Back

x = 6.

Front

If 5/10 = x/20, what is the value of x?

Back

x = 10.

Front

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 is the relationship between equivalent ratios?

Back

Equivalent ratios are ratios that express the same relationship between numbers.

Front

Solve the proportion: 4/8 = x/16.

Back

x = 8.

Front

What does it mean if two ratios are not proportional?

Back

It means that the ratios do not express the same relationship and cannot be set equal to each other.