Question

if the number 7,14,28 are in continued proportion then the mean proportion between 7and 28 is​

Answer 1

Answer:

let the there numbers be

a,b,c

As they are in continued

Proportion

b

2

=ac

mean is 12

∴b=12

So, 12

2

=ac

144=ac

c=144/a

Sum of two number is

a+c=26

a+

a

144

=26

Solving,

=a

2

+144−26a=0

=a

2

−18a−8a+144=0

=a(a−18)−8(a−18)=0

=(a−18)(a−8)=0

∴a=18 or a=8

c=8 c=18

∴ The numbers are :-

8,12,18 or 18,12,8