Proportions

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Front

If a/b = c/d, what can we say about the cross products?

Back

The cross products are equal: a*d = b*c.

Front

Solve for m: 3/5 = 9/m

Back

m = 15.

Front

Solve for m: m/11 = 7/257

Back

m = 77/257.

Front

Solve for c: 4/5 = c/7

Back

c = 28/5.

Front

Solve for x: x/10 = 18/9

Back

x = 20.

Front

Solve for c: 6/18 = c/12

Back

c = 4.

Front

What is the first step to solve a proportion?

Back

Cross-multiply the two ratios.

Front

What does it mean if two ratios are equivalent?

Back

It means they represent the same relationship or part-to-whole comparison.

Front

How can you check if two fractions are in proportion?

Back

You can cross-multiply and see if the products are equal.