Question

find the fourth proportional of 4 5 and 8​

Answer 1

Step-by-step explanation:

let the forth proportional be x

then:

product of means=product of extremes (eqn.1)

since in 4:5: :8:x

product of means=8×5=40,and

product of extremes=x×4=4x

since by eqn.1

4x=40

since x=10

since forth proportional to 4,5and8 is 10

Answer 2

Answer:

10

Step-by-step explanation:

let the fourth proportional be x

4:5::8:x

it can be written as ,

4/5 = 8/x

4x = 40

x = 10