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 two ratios and then solve for the unknown variable.

Front

What does cross-multiplication involve?

Back

Cross-multiplication involves multiplying the numerator of one ratio by the denominator of the other ratio.

Front

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

Back

x = 12.

Front

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

Back

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

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

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

Back

x = 10.

Front

What is the relationship between ratios and proportions?

Back

Ratios compare two quantities, while proportions show that two ratios are equal.

Front

Solve for x: 2/3 = x/9.

Back

x = 6.

Front

What is a unit rate?

Back

A unit rate is a ratio that compares a quantity to one unit of another quantity.