If a, x1, X2, X3, B and a, Y1, Y2, Y3, Y4, Y5, B all form an arithmetic sequence, find (x3-x1) / (y3-y1) Process details

a. If x1, X2, X3 and B are equal difference D1, then B-A = 4d1 and x3-x1 = 2D1 = (B-A) / 2
a. For the difference D2 of Y1, Y2, Y3, Y4, Y5, B, then B-A = 6D2 and y3-y1 = 2d2 = (B-A) / 3
So (x3-x1) / (y3-y1) = [(B-A) / 2] / [(B-A) / 3] = 3 / 2 = 1.5

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