1/3 , 2/5 and 8.4
find the fourth proportional.
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Answer:°• 1/3 : 2/5 = 8.4 : X
=> 1/3 / 2/5 = 8.4/X
=> 1/3 × 5/2 = 8.4/X
=> 5/6 = 8.4/X
=> 5X = 6 × 8.4
=> 5X = 50.4
=> X = 50.4/5
=> X = 10.08
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