Proportions

Front

What is a proportion?

Back

When two ratios are equivalent and show the same value.

Front

How can you determine if two ratios form a proportion?

Back

If the cross products of the ratios are equal.

Front

What does it mean if a graph is proportional?

Back

The y to x ratio is constant and the graph passes through the origin (0,0).

Front

What is a non-proportional graph?

Back

A graph that does not pass through the origin (0,0) or has a changing ratio.

Front

If the ratios 1:2 and 2:4 are compared, do they form a proportion?

Back

Yes, they form a proportion because they are equivalent.

Front

If the ratios 3:4 and 5:6 are compared, do they form a proportion?

Back

No, they do not form a proportion because they are not equivalent.

Front

What is the cross product of the ratios 2:3 and 4:6?

Back

The cross product is 2*6 = 12 and 3*4 = 12, so they are proportional.

Front

What is an example of a proportional relationship in real life?

Back

The relationship between distance and time at a constant speed.

Front

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

Back

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

Front

What is a ratio?

Back

A comparison of two quantities by division.