I've moved this to the InDesign forum because that was one of the two programs you mentioned using. It's much more likely to get answer from the color geeks here that in the Creative Suite forum.
The colormanegement in the Creative Suite/Cloud calculates different values depending on the profiles you have used.
- Your input color mode is CMYK
- You did not mention your input Color Profile, only if the color mode and color profile is known and specified you have a specified color, with different input profiles in CMYK you will get differen colors.
- Your output color mode is RGB, but if you convert into different RGB color spaces you will get different values. So you have to determine the correct RGB color space, you need to choose a color profile.
A lot of internet color calculators are missing these important facts, so the calculated values are not relevant.
If you want to show RGB colors correct in the Web or in MS Office (like PowerPoint presentations) you might choose sRGB as output profile. But take care that you have chosen the correct CMYK profile first.
the CMYK values for the blue logo are 79, 56, 2, 0 and when I click on the RGB tab in InDesign or Illustrator, these programs tell me that the RGB equivalent is 69, 112, 179.
69|112|179 is the conversion you'll get using the default North American General Purpose Color Settings—or US Web Coated SWOP v2 converted to sRGB. As Willi implies there are many flavors of CMYK and RGB so different sources and destinations, as well as the conversion intent, will produce different results.
So "branding" color this way doesn't really work because 79|56|2|0 CMYK will look very different on newsprint than it will on a GRAcol profiled press with glossy paper, and 69|112|179 RGB will look very different in a CC app with a ProPhoto RGB assignment then it will look in a web browser with no profile assigned.
The best you can do is qualify the values—79|56|2|0 US Web Coated (SWOP) v2 CMYK = 69|112|179 sRGB IEC6196-2.1 RGB