Four numbers 3

What least number must be added to each of the numbers 6,15,20 and 43 to make them proportional?

Correct answer:

x =  3

Step-by-step explanation:

(6+x):(15+x) = (20+x):(43+x)  (6+x) (43+x)=(20+x) (15+x)  14x=42  x=1442=3  x=3   Verifying Solution:   a2=6+x=6+3=9 b2=15+x=15+3=18 r1=a2:b2=9:18=21=0.5=1:2  c2=20+x=20+3=23 d2=43+x=43+3=46 r2=c2:d2=23:46=21=0.5=1:2



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