Question

What number should be added to each of the number 18 28 30 46 so that they are in proportion

Answer 1

18 + x : 28 + x : 30 + x : 46 + x

18 + x    =    30 +x  

28 + x         46 + x

(18+x)(46+x) = (30+x)(28+x)

828 + 18x + 46x + x²  =  840 + 28x + 30x + x²

828 + 64x = 840 + 58x

64x - 58x = 840 - 828

6x = 12

x = 2

Answer 2

Step-by-step explanation:

let the number must be added each of the

number be x

•18 + x : 28+ x : :30+x : 46+x

•Pro product of extreme = product of mean

•(18+x )×( 46+x) = (28+x)×(30+x)

•824+18x+46x+x+x=. 840+28x+30+x+x

•828+64x = 840-58x

•64x-58x = 840-828

• 6x=12

• x= 12÷6

•x = 2 ans