Determining ActiveLayout Plot Scale

I need to query the activelayout's current scale factor for plotting. Here
is what I have found so far.
The following ONLY works if a standard scale is not being used:
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dim numerator as double, denominator as double
set objLayout=ThisDrawing.Layouts.Item("Layout1")
objlayout.GetCustomScale numerator, denominator
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If a standard scale is being used the above returns 1/1!!
You can determine the standardscale being used by:
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var = objlayout.StandardScale
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It returns an enum value. There is no enum value called "Custom"

If the StandardScale is "acScaleToFit" there is NO way to determine the
scale required to make the layout FIT the page.

How do I determine what scale factor is being used for ScaleToFit?