Find the fourth proportion of 42,12,7
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42:12 :: 7:x
42 × x = 12 × 7
42x = 84
x = 84/42
x = 2
Thus fourth proportion is 2.
42 × x = 12 × 7
42x = 84
x = 84/42
x = 2
Thus fourth proportion is 2.
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