New to ableton and need help with getting at tempo in decimals

Working on a project for college involving sampling and I have to use Ableton. For one of the sounds I want to warp the clip to a very specific tempo. 138 sounds very slightly too slow but 139 sound slightly too fast to match the other samples I am using, it looks like I can only adjust the sample tempo in increments on 1 but want to test something like a 138.5 or more exact if possible, I know it sounds small but I want to get as percise as I can for this project.