Proportions and Cross Products

Solve the proportion.

• k=5

• k=3.3333333

• k=60

• k=90

Solve the proportion:

• 3

• 4

• 9

• 6

Cross Multiply/Cross Products

• 15

• 420

• 28

• 16

Solve the proportion.

• p=31.3

• p=308

• p=924

• p=532

Proportions are equal when...

• when the ratio is different

• when the cross products are equal

• when the numerators and denominators are equal straight across

• None of the above

If the Cross Products are equal, then..................

• the two ratios are NOT proportional.

• the two ratios are proportional

Use cross products to determine if these ratios are proportional:
2/3 = 10/15

• no

• yes

The cross products of the proportions 2 : 5 and 30 : 75 are

the products of the terms of the diagonals when two ratios are compared.

• Proportion

• Equivalent Ratios

• Butterfly Method

• Cross Products

Cross Products of a proportion are _________ equal.

• ALWAYS

• SOMETIMES

• RARELY

• NEVER