Question

Find the fourth number in proportion 4,5,8,_?​

Answer 1

Answer:

x=10

Step-by-step explanation:

let the fourth no be x

given= 4,5,8,x

product of extremes = product of means

=)4×x=5×8

=)4x=40

=)x=40/4=10

hope it helps you

Answer 2

Answer:

10

Step-by-step explanation: We know that,

1st quantity x 4th quantity = 2nd quantity x 3rd quantity

Therefore, 4 x 4th quantity = 5 x 8

or, 4th quantity = 5 x 8 / 4

                          = 5 x 2 /1

                          = 10