Sliding Results Bar by Variable - impossible?

I've created a self assessment that maps a company's readiness level for adopting innovation.  They score themselves on a range of metrics and end up somewhere on a 5 point scale showing their current readiness, and clearly displaying what they need to do to move themselves closer to full readiness, however it isn't as simple as 5 - there are graduations between the numbers. I want their result to fill up a meter in a smooth and visually appealing graphic which slides from the left to the right, and stops where they are in their readiness level, which might include 3.2, 3.25, 4.15 etc.

I'm having real difficulty making this animation based on the variable from their results. (I have the final variable by using triggers to add the results one by one to a new variable, then divide that result by 5, thus making the average which is their final score).

Motion paths can't be edited based on a variable (ie, motion path to stop 'variable' percent of the path); motion paths go from the center of the object, not the edge meaning imprecise ending of the motion across a range; layering and using states means I have to do something like 50 states to show the graduations between numbers which is a lot of work and still isn't going to show the graduations I want to show. Using a slider won't work as you can't change the colours of the slider track as the thumb moves. 

Can anyone help me? Surely I'm not the only one who wants to show results by percentage, with accuracy in this way? Think of the ways to use it - filling up a jar to a percentage point... Superimposing a syringe image and decreasing a quantity by a percentage...  Making a tug-of-war concept that changes by percentage to demonstrate equal and opposing concepts...