Proportions and Cross Multiply

Solve the proportion.

• k=5

• k=3.3333333

• k=60

• k=90

Cross Multiply/Cross Products

• 15

• 420

• 28

• 16

Solve the proportion.

• p=31.3

• p=308

• p=924

• p=532

Which ratio below is proportional to the ratio  5/6?

• 6/5

• 50/75

• 25/30

• 12/10

• 10

• 5

• 20

• 15

How can you solve this proportion?

• Divide 30 by 8, then multiply by 12

• Cross multiply 12 x 8, then divide by 30

• Cross multiply 8 x 30, then divide by 12

Select ALL statements that support these two ratios being proportional.

• Both cross-products are 400.

• The cross-products are 160 and 1000.

• The cross-products are 250 and 640.

• The simplified ratios are 5/8 and 25/40.

• The simplified ratios are both 5/8.

What would the new equation be after using cross multiplication?

• q = 2

• q = 9

Solve the proportion:

• c = 4

• c = 8

• c = 14

• c = 10

• 12

• 6

• 3

• 9