If 15, 45, 24 are the first three terms of a proportion, find the fourth term.
72
If a, b, c, d are in proportion then a : b :: c : d, which gives a × d = b × c.
Here a = 15, b = 45, c = 24, and d is unknown.
15 × d = 45 × 24
15d = 1080
d = 1080 / 15 = 72.
Hence, the correct answer is 72.
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