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Grade 8 - Mathematics
2.13 Proportion - II

Example:
The circumference of a circle with a diameter of 4 meters is about 12.56 meters. A circle's circumference is proportional to its diameter. Write an equation relating the circumference of a circle to its diameter. What would be the circumference of a circle with a 5-inch diameter?
The constant of proportionality between circumference and diameter
12.56/4 = 3.14

The circumference is about 3.14 times the diameter.
Let C = circumference and d = diameter.
C = 3.14d = 3.14(5) = 15.7
The circumference is about 15.7 inches

Directions: Choose the correct answer. Also write at least 5 examples of your own.
Q 1: 7:5 = 49:30, are they in proportion?
Yes
No

Q 2: Find the missing quantity of the proportion in 4:5 = ___:25.
15
20

Q 3: Find the mean proportional of 20 and 5.
10
15

Q 4: Find the missing quantity of the proportion in __:10 = 45:50.
7
9

Q 5: 2:5 = 10:25, are they in proportion?
Yes
No

Q 6: Find the missing quantity of the proportion in 7:__ = 21:24.
8
6

Q 7: John sells 6 ounces chocolate for $2.70, how much does she charge for 10 pounds of chocolate?
68
55
72

Q 8: 9:15 = 81:225, are they in proportion?
Yes
No

Question 9: This question is available to subscribers only!

Question 10: This question is available to subscribers only!


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