This is from the trivia section of the Nether wiki page. I remembered it being different too in the past. I think I played on a small or classic world where the ratio was only 1:3.

In Legacy Console Edition, the size of the Nether is limited, with bedrock walls surrounding it on all sides. The Overworld-Nether ratio varies depending on the world size: it is 1:3 for Classic and Small worlds, 1:6 for Medium worlds, and 1:8 (the same as Java and Bedrock editions) for Large worlds.

Edit: Removed link to outdated wiki to avoid SEO pollution.