Ratios and Proportions Big Ideas

What is the constant of proportionality of this table?

• 0

• 1

• 10

• 13

About 13 out of 20 homes have a personal computer. On a street with 60 homes, how many would you expect to have a personal computer?

• 39 Computers

• 4.3 Homes

• 39 Homes

• 4.3 Computers

Is this table proportional?

• Yes

• No

Is this graph proportional?

• Yes 

• No

A proportion is two ratios that are ________.

• Equal

• variable

• unequal

• matching

To solve a proportion, you

• cross simpify

• cross multiply

• cross divide

Determine whether each pair of ratios forms a proportion

• Proportion

• Not a Proportion

Select the proportions that are equivalent to

The distance that an automobile travels varies directly as the time it travels. If the car travels 280 miles in 7 hours, how far will it travel in 12 hours?

• 480

• 1960

• 84

• 25

A 12-ounce bottle of shampoo lasts Enrique 16 weeks. How long would you expect an 18-ounce bottle of the same brand to last him?

• 24 Weeks

• 24-ounce bottle

• 10.6 Weeks

• 10.6-ounce bottle