Substance Designer - Question about creating a parameter

Jace213

Hey y'all, I'm currently working on a wood floor material and I wanted to break up the boards using luminance variation on a tile generator node attached to the color blends. For the board shape I've found that if I scale the Y amount to be 3 times the X amount it keeps the correct shape while tiling the material. For functionality purposes I wanted to create a tiling parameter, but I don't know enough about creating functions to create one that scales the Y amount to always be 3 times the X amount. I hope I didn't word that super confusing like an idiot, I'll attach a picture that might help illustrate what I'm asking? Thanks in advance for any help!