The mean proportion between 45 and a certain number is three times the mean proportion between 5 and 22. Find the number.
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terms between 5 and 22 are
6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21
no.of terms = 16
mean = 16+1/2 th term
= 17/2 term
8.5th term
= 13.5
means propotion 3 times 13.5 = 3(13.5)
= 40.5
so number should be 35
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