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Online Quiz (Worksheet A B C D)

Questions Per Quiz = 2 4 6 8 10

Grade 8 - Mathematics
2.14 Proportion - I

Two quantities are proportional if they have a same ratio or rate.


  • Two ratios set equal
  • Setting two fractions equal
  • Solved by cross multiplying
  • Direct or inverse
  • Example: a/b = c/d
    cross products ad =cd
    ad and cb are called the cross products of this proportion.
    The cross products of any proportion are equal.
  • the product of extremes in a proportion = the product of means in the proportion.
  • Cross products can be used to determine whether two ratios are in proportion.
3/2 = 9/x
cross products: 3x = 18
x = 6

q/25 = 52/100
cross products: q x 100 = 25 x 52
100q = 1300
q = 13

Directions: Answer the following questions. Also write at least ten examples of your own.
Q 1: What are the means in 25:30 = 250:300.
12 and 112
42 and 75
30 and 250

Q 2: The terms at the middle of a proportion are called ______.

Question 3: This question is available to subscribers only!

Question 4: This question is available to subscribers only!

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