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Why different values in Illustrator/InDesign/PS when converting Pantone to RGB & CMYK?

Update:10-11Source: network consolidation
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I'm starting off with a pantone color in InDesign and trying to determine a close and consistent approximation of RGB, CMYK, and Hex. When I do this conversion in InDesign, I get different results than if I do it in Photoshop or Illustrator. I have all the apps working at the same color management setting (Adobe RGB (1998) and US Web Coated (SWOP) v2). I'm working old school in CS1.
Here are my results for Pantone 187C:
InDesign
Photoshop
Illustrator
RGB
171 x 0 x 34
153 x 33 x 55
167 x 37 x 53
CMYK
0 x 100 x 79 x 20
21 x 100 x 81 x 12
16 x 100 x 86 x 6
HEX
992137
A72535
I realize that any conversion from Pantone is an approximation, but why do the different applications yeild different results? I'm fairly new to color management and print (I come from the video world), so any efforts to dumb down explanations are appreciated.

The Best Answer

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Photoshop's default is to use Lab values when converting from spot colors. So you need to set InDesign and Illustrator to use the same values.
In Illustrator, from the Swatches panel menu, choose Spot Color Options. Choose Use Lab Values specified by the book manufacturer.
In InDesign, from the Swatches panel menu, choose Ink Manager. At the bottom, check Use Standard Lab Values for Spots