Creating Proportions

Which is a good example of two ratios that are proportional? 

• 1/3 = 4/7

• 1/2 = 2/4

• 15/1 = 30/5

• 20/10 = 35/5

How do you know if a graph is proportional?

• The line will pass through the origin and be curved.

• The line must be straight and pass through the origin.

• The line must pass through any point on the "y- line"

• The line will be positive.

Find the constant of Proportionality:

• 5

• 2.5

• 3

• 1.5

What is the unit rate in this proportional relationship?

• 60 miles/1 hour

• 120 miles/ 2 hours

• 1 mile/ 1 hour

A survey in a school found that 60 students own a bicycle. If this represents 30% of all students, how many students are in the school?

• 180

• 200

• 220

• 240

• 4

• 6

• 8

• 10

• 8

• 12

• 16

• 20

A recipe calls for 3 cups of flour for every 4 cups of sugar. If you want to use 6 cups of sugar, how many cups of flour do you need?

• 4.5

• 5

• 4

• 4.5

A recipe calls for 3 cups of flour for every 4 cups of sugar. If you want to make a half batch, how many cups of sugar do you need?

• 2 cups

• 3 cups

• 4 cups

• 6 cups

What is the constant of proportionality?

• $3

• $4

• $2

• $9