in a proportion the 1st 2nd and 3rd term are 55,110,120.find the 4th proportion
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let the fourth proportion be X
55 : 110 :: 120 : X
mean numbers are = 110 ,120
extreme numbers are = 55 ,X
product of mean = product of extreme
110× 120 = 55× X
110 × 120 / 55 = X
2 × 120 = X
240 = X
hence the fourth proportion is = 240
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