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 isolate the 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 value of k if 3/k = 1/5?

Back

k = 15.

Front

If 4/x = 2/8, what is x?

Back

x = 16.

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: 5/15 = k/45.

Back

k = 15.

Front

If 7/21 = 1/x, what is x?

Back

x = 3.

Front

What is the first step in solving the proportion 8/12 = x/18?

Back

Cross-multiply to get 8*18 = 12*x.

Front

If a proportion is set up as 9/27 = 3/x, how do you find x?

Back

Cross-multiply to find x = 9.