Hi Chandan,
You can try:
1) Highlight all columns, A(X1), B(Y1), C(X2), and D(Y2).
2) Choose "Analysis: Mathematics: Simple Curve Math" menu.
3) In the open tool, choose:
Operator = Divide
Reference Data = D(Y)
Output = (<input>,<new>)
and click OK to run.
Now you see the ratio of curve(B)/curve(D) based on the A(X) dataset. If you want to get the result
based on C(X), you can set the Input1 branch to D(Y), and Reference Data to B(Y).
Does this procedure work for you?
--Hideo Fujii
OriginLab
P.S. In the Simple Curve Math tool's dialog, there is a check box, "Use Common Range Only". If you turn ON
this check box, it produces the result with only overlapped X range, obtained only by interpolation.
Otherwise, the output obtained contains the result of extrapolation, and you can avoid it by this check box.