1) Find the fourth proportional of 13/3, 39/4,17/2...
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Solve - Let the fourth proportion be X.
13/3 : 39/4 :: 17/2 : X
Product of extreams = 13/3 × x = 13/3x
Product of means = 39/4 × 17/2 = 663/8
= 13/3x = 663/8
= x = 663/8 ÷ 13/3
= x = 663/8 × 3/13
= x = 1989/104
Hence , The fourth proportion is 1989/104.
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