find the mean proportional between 16 and 25
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Question:-
Find the mean proportional between 16 and 25.
Answer:-
Since 16 , x , and 25 are in continued proportion then
16 : x :: x : 25
if a : b = b : c i.e. a/b = b/c i.e. b² = ac
if a , b , c are in continuous proportion then the middle term b is called the mean proportion between 'a' and 'c' , 'a' is the first proportion and 'c' is the third proportion
Thus , if b is the mean proportion between 'a' and 'c'
then b² = ac i.e. b = √(ac)
x² = 16 × 25
x² = 400
x = √(400) = 20
Hence the mean proportion is 20
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