Question
Find the fourth proportion of (k + 3), (2k - 6), and (4k -
9). (Note: 'k' is the smallest two-digit prime number.)Solution
k = 11
k + 3 = 14
2k - 6 = 22 - 6 = 16
4k - 9 = 44 - 9 = 35
14 : 16 :: 35 : m
14m = 16 Ă— 35 = 560
m = 560 Ă· 14 = 40
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