I think this is basic programming/math thing and how specific functions works you should check elsewhere, for example on Linear interpolation - Wikipedia where you have even code samples. You have it in engine as function Lerp, but that’s right, is good to know how things works, for example for game performance - you can use more or less consuming function if you know how it works and what it doing in background. This is more important when you working with many instances like ai hordes, with loops etc.