How Would One Find an Equation for this?

I will messing around with eds thingy and noticed that if you lets say multiply a base 60 pokemon's stats by 1.5 (choice band) its equivilent base stat is no 90 but 115. Which is 1.92 times. I decided to test a few other base stats:

5 -> 32 (lowest: Chansey)

6.4 times

80 -> 145

1.81 times

100 -> 175

1.75 times

180 -> 285

1.64 times (Highest: Deoxys attack)

It appears to be some sort of rational equation but so far online I have been unable to find a rational equation stat plotter program. Hopefully ed can help me out on this.