Proportions

Front

What is a proportion?

Back

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

Front

How do you determine if two ratios are proportional?

Back

Two ratios are proportional if their cross products are equal.

Front

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

Back

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

Front

If a Transformer stands 20 ft. tall with a shadow of 6 ft. long, what is the ratio of height to shadow length?

Back

The ratio is 20:6 or simplified to 10:3.

Front

If a Transformer is 30 ft. tall, how long would its shadow be if the ratios are proportional?

Back

The shadow would be 9 ft.

Front

What are two equal ratios or rates called?

Back

Proportion.

Front

What is a unit rate?

Back

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

Front

If Xavier weighs 90 pounds on Earth, how much would he weigh on the Moon if the ratio is 6:1?

Back

He would weigh 15 pounds on the Moon.

Front

Are the ratios 12/14 and 30:35 proportional?

Back

Yes, they are proportional.

Front

Are the ratios 7:12 and 5 to 8 proportional?

Back

No, they are not proportional.