Example:

Wikipedia said that a 1932 Ford has a 106in/2.62m wheelbase.

The Ford loaded way oversized in my scene, so I added my meter scaling prop, scaled it to 269 % and then scaled the Ford to match that dimension.

It now matches 1.65m tall Hana exactly.

I also will resafe the re-scaled Ford back to my library to replace the original one.

Do this with all your figures/props, and you'll never have to worry about mis-matched scaling again.