Question
Determine the fourth proportion for 20, 25, and
40.Solution
ATQ,
Fourth proportion of numbers a, b, and c is:
d = (b × c) / a
Let the required fourth proportion be d.
(20 / 25) = (40 / d)
d = (25 × 40) / 20
d = 1000 / 20 = 50
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