Question

what no should be added to each no 12,22,42,72 so that the result is in proportion ​

Answer 1

Step-by-step explanation:

let the number be x

acc to question

12+x:22+x::42+x:72+x

(12+x)(72+x)=(42+x)(22+x)

12*72+12x+72x+x^2=42*22+42x+22x+x^2

864+94x+x^2=924+64x+x^2

94x-64x=924-864+x^2-x^2

20x=60

x=60÷20

x=3

therefore 3 is added to 12,22,42,72, to get proportional

verification....

12+3:22+3::42+3:72+3

15:25::45:75

3:5::3:5

Answer 2

Answer:

$524 ]{?} }^{?}$