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### Grade 8 - Mathematics2.13 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: 9:15 = 81:225, are they in proportion? YesNo Q 2: On a map, 3 inches represent an actual distance of 30 miles. If the distance between the two cities on the map is 15 inches, What is the actual distance between them?150804100 Q 3: 7:5 = 49:30, are they in proportion?NoYes Q 4: Find the missing quantity of the proportion in 7:__ = 21:24.68 Q 5: 3:7 = 9:21, are they in proportion?NoYes Q 6: Find the missing quantity of the proportion in 4:5 = ___:25.1520 Q 7: John sells 6 ounces chocolate for \$2.70, how much does she charge for 10 pounds of chocolate?687255 Q 8: Find the missing quantity of the proportion in __:10 = 45:50.79 Question 9: This question is available to subscribers only! Question 10: This question is available to subscribers only!