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Introduction to Proportions

Are 30, 40, 4...

Question

Are 30, 40, 45 and 60 in proportion?

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Solution

Ratio of 30 to 40 $= \frac{30}{40} = 3 : 4$
Ratio of 45 to 60 $= \frac{45}{60} = 3 : 4$
Since, 30 : 40 = 45 : 60.
Therefore, 30, 40, 45, 60 are in proportion.

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Q. Determine if the following numbers are in proportion:

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Question 1(a)

Determine if the following are in proportion:

15, 45, 40, 120

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