Proportions: Proportions or Not a Proportion

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 form a proportion?

Back

To determine if two ratios form a proportion, cross-multiply and check if the products are equal.

Front

What is the cross-multiplication method?

Back

The cross-multiplication method involves multiplying the numerator of one ratio by the denominator of the other ratio and vice versa.

Front

If the ratios 2:3 and 4:6 are given, do they form a proportion?

Back

Yes, they form a proportion because 2 * 6 = 3 * 4.

Front

If the ratios 1:2 and 3:5 are given, do they form a proportion?

Back

No, they do not form a proportion because 1 * 5 ≠ 2 * 3.

Front

What is a ratio?

Back

A ratio is a comparison of two quantities by division.

Front

Can a proportion be represented as a fraction?

Back

Yes, a proportion can be represented as a fraction where the two ratios are equal.

Front

What is an example of a real-life proportion?

Back

If a recipe calls for 2 cups of flour for every 3 cups of sugar, the ratio of flour to sugar is a proportion.

Front

What does it mean if two ratios are not a proportion?

Back

It means that the two ratios do not represent the same relationship or value.

Front

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

Back

If a/b = c/d, then ad = bc, where a, b, c, and d are the values in the proportion.