Proportional Cross Products

Which ratio is proportional to 18/27?

• 1/9

• 12/18

• 21/30

• 90/220

What is the cross product of the proportion?

• 14

• 12

• 126

• 42

There are 960 calories in 8 servings of Amy's cookies. There are 460 calories in 2 servings of Henry's cookies. Do the two rates form proportions?

• Yes, their cross product is 1920.

• Yes, their cross product is 3680.

• No, their cross products are not equal.

• Yes, their cross product is 7680.

Determine whether the ratios form a proportion:

• Proportional

• Not Proportional

Are x and y proportional?

• Yes.

• No.

What is the correct next step when using the cross product method on this problem?

• 1(10) = 2(5)

• 1(5) = 2(10)

• 1(2) = 5(10)

• 2

• 4

• 13

• 12

• x = 3

• x = 1

• x = 12

• x = 48

True or False: This equation is a proportion because it has two equivalent ratios separated by an equal sign.

• True

• False

Select the statement that supports these two ratios being proportional.

• Both cross-products are 216.

• The cross-products are 96 and 486.

• The cross-products are 144 and 324.