Question

Write the fourth proportional of 1/3,2/5,8.4

Answer 1

Step-by-step explanation:

1/3 = 0.333

= 0.3

2/5 = 0.4

8.4 = 8.4

0.3 : 0.4 :: 8.4 : X

Product of means=Product of extremes

0.4 × 8.4 = 0.3 × X

3.36 = 0.3X

X = 3.36/0.3

X = 11.2

the fourth proportional is 11.4

Checking whether answer is right

We know that

product of means = product of extremes

0.4×8.4 = 0.3×11.2

3.36. =3.36

Hence the required fourth proportional is 11.2