Cross Multiplication Proportional Relationships

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

Solve the proportion.

• k=5

• k=3.3333333

• k=60

• k=90

Cross Multiply/Cross Products

• 15

• 420

• 28

• 16

Which of the tables above represents a proportional relationship?

• a & c

• a, b & c

• a, c & d

• all of them

150 grams of fertilizer is required for a land area of 6 square acres.  At this rate, how many grams of fertilizer is needed for 13 square acres?

• 25 grams

• 300 grams

• 325 grams

• 310 grams

Four pounds of bananas cost $6.  What is the cost per pound of bananas?

• $24 per pound

• $1.50 per pound

• $1 per pound

• $6 per pound

What makes a graph proportional? Choose all that apply (3)

• The graph is a straight line

• The graph goes through the origin (0,0)

• The graph is a curved line

• The graph is reflective.

Is this table proportional or non-proportional?

• Proportional

• Non-Proportional

Is the given table a proportional relationship? If so, what is the constant of proportionality?

• Yes; 1/3

• Yes; 3

• Yes; 5

• No

Craig earns extra money as a lifeguard. He earns $37 for 4 hours and $64.75 for 7 hours.  What is the constant of proportionality in dollars per hour? 

• $37 / hour

• $64.75 / hour

• $9.25 / hour

• $18.50 / hour