Perhaps you should link us to the RIT values you are speaking about.
CMYK stands for Cyan, Magenta, Yellow, and Black (K) plates used in color offset printing.
The percentages are for each plate 0-100 %
RGB is for color monitors Red 0-255, Green, 0-255 and Blue 0-255.
Dyes probably use a different scheme.
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You are correct, C, M, Y and K stands for Cyan, Magenta, Yellow and Black. Those are percentages of CMYK colors which are measured from 0 to 100% while RGB values are represented with numbers 0 to 255.
Numbers for RGB values are creating color inside circle or inside square in the middle in your screenshot and those numbers translated to CMYK colors are represented on the right side: C: 4%, M: 28%, Y: 28% and K: 0%.
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The numbers represent the individual colour levels RGB or CMYK being used to produce the image colour. However those numbers only apply in the specific Color Space being used. Change the colour space and the same numbers will produce a different colour (or the same colour will require different numbers).
Does the RIT system give you formulas for matching to PANTONE color libraries? If so, you could click on libraries in the colour picker and use the appropriate PANTONE colour in your image then mix it with the RIT dyes.