The value of the rating control is based on the number of items that it contains. So if you want the exactly same bar rating with 5 items and you want to have a progress from 0 to 100 in steps of 5, you need to increment the value for the rating with 0.25 for each step, so finally you will get 5x20 = 100 -> 0.25x20 = 5. If you need more help on this feel free to ask.
the Telerik team
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system and vote to affect the priority of the items