Proportions and Nonproportions

An urn has four different colored balls. The ratio of blue balls to red balls is 3 : 7 and the ratio of green balls to yellow balls is 9 : 21. Are the ratios of blue balls to red balls and green balls to yellow balls equivalent?

• Yes, because the product of the means and extremes are both equal to 63.

• No, because the products are different.

Write a ratio in simplest form:
12 CD's to 4 tapes

• 3/1

• 4/1

• 12/4

• 6/1

Write a ratio in simplest form:
10 automobiles to 13 bikes

• 1/3

• 10/13

• 4/5

• 3/1

Write a ratio in simplest form:
8 apples to 24 oranges

• 3/24

• 3/1

• 1/3

• 1/4

Write a ratio in simplest form:
22 cats to 33 dogs

• 22/33

• 3/2

• 1/2

• 2/3

Write a ratio in simplest form:
8 students to 18 tables

• 4/9

• 8/18

• 9/4

• 4/5

Is this proportion equal?
1/3     4/12

• =

• ≠

Is this proportion equal?
2/7     24/86

• =

• ≠

Is this proportion equal?
9/12  27/36

• =

• ≠

Is this proportion equal?
1/3  5/6

• =

• ≠