# Geometry nodes vector interpolation issue

I'm trying to translate the vertices of one object in the direction of the nearest vertices of a second object. I know this can be achieved by blending the two vectors using a mixRGB node like this:

My issue is that the possible positions are limited to the space between the two vectors. How would I do this so that I could translate past the limits in both directions? Sort of like the factor being any value, not just between zero and one.

I feel like this is simple vector math but I can't seem to articulate this problem into a relevant web search.

To escape the limitation that RGB color-components can't have values outside 0-1, you can make your own 'Mix Vector' node-group, whose output is Fac * B + (1-Fac) * A: