Question
Find the fourth proportion of (2k - 5), (k + 1), and (3k +
4). (Note: 'k' is the smallest two-digit prime number.)Solution
k = 11 (smallest two-digit prime)
2k - 5 = 22 - 5 = 17
k + 1 = 11 + 1 = 12
3k + 4 = 33 + 4 = 37
17 : 12 :: 37 : m
17m = 12 × 37 = 444
m = 444 ÷ 17 = 26
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