text: (a+b)/(a-b)=(b+c)/(b-c)\n(a+b)(b-c) = (b+c)(a-b)\nab-ac+b2-bc = ab-b2+ac-bc\nb2 + b2 = ac + ac\n2b2 = 2ac\nb2 = ac\nbb = ac\nb/a = c/b\n\nIf a, b and c are in a geometric sequence, the ratio of the numbers would be the same.