Math geniuses of PICLIST:

I have a series of 40 points that represent a curve.  It's not a linear
curve.  In fact, it doesn't necessarily even have a positive slope
throughout.  What I want to do is to create a scaling that is variable
depending on the position on the curve.  It's probably best to give an
example:

point 40 = 100 (dec.)
point 30 = 80
point 20 = 75
point 10 = 70
point 1 = 35

Let's say at point 30, we want to add an additional 10% to the value.  So, I
want to add an additional 10% also at all the other points (3 or 4 at point
1 and 10 at point 40).  This will, of course, change the characteristics of
the curve as a whole, but it is necessary in this application.

Any quick ways?  My initial idea was to take the percentage and try to
multiply it out, but I'm not sure how this would work over the entire
percentage range (i.e., I could be adding as little as 1% or as much as
200%) and I would probably need some sort of floating point math for any
sort of precision at the lower values.

My other idea was just to take the endpoints, find the ratio between them,
and linearly scale the intermediate points, even though that's not entirely
accurate, but it's better than nothing.

Thanks,
--Andrew
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