Question

If the same number be added to the numbers 5,11,15 and 31 ,the resulting numbers are in proportion.Find the number.(a/b=c/d)

Answer 1

5+x,11+x,15+x,31+x are in proportion 5+x×31+x=11+x×15+x 155+36x+x^2=165+26x+x^2 10x+x^2=10+x^2 10x=10x=+