Ratios Cross Multiply to Find X

How do we find cross-products?

• Multiply the ratios diagonally.

• Multiply the ratios horizontally.

• Multiply the ratios vertically.

• Multiply the ratios curvilinear-ly.

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.

Select the statement that supports these two ratios being NOT proportional.

• Both cross-products are 20.

• The cross-products are 10 and 40.

• The cross-products are 8 and 50.

Select the statement that supports these two ratios being proportional.

• Both cross-products are 400.

• The cross-products are 160 and 1000.

• The cross-products are 250 and 640.

Select the statement that supports these two ratios being proportional.

• Both cross-products are 3960.

• The cross-products are 2640 and 5940.

• The cross-products are 2904 and 5400.

Select the statement that supports these two ratios being NOT proportional.

• Both cross-products are 24.

• The cross-products are 18 and 32.

• The cross-products are 12 and 48.

Are the two ratios proportional?

• YES

• NO

For the proportion, what common product do you get when cross-multiplying?

• 148

• 167

• 112

• 224

What is the ratio of red apples to green apples

• 7 apples to 3 green

• 4 red apples to 7 apples

• 4 red apples to 3 green apples

• 3 green apples to 4 red apples

What are two methods for determining whether two ratios are proportional? Make sure you select them BOTH.

• Simplifying

• Finding the reciprocal

• Finding the cross-products

• Adding them together