Question
If the third proportion of 30 and 45 is “0.5k”, then
find the value of (k − 18) : (k + 22).Solution
Third proportion of two numbers ‘a’ and ‘b’ is (b²/a).
So, 0.5k = (45²/30) = 67.5
Or, 'k' = 135
Required value = (135 - 18) : (135 + 22) = 117 : 157 = 39 : 52
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