Find the fourth proportional of 14 ,7 and 10
5
Let x be the fourth proportional
Then we have 14 : 7 :: 10 : x
When the numbers are in proportion , then Product of means = Product of extremes
Hence 14x=7×10
x=7×1014
x=5
Hence the fourth proportional of 14 , 7 and 10 is 5