This is probably simpler that I'm making it (it would have to be), but I'm stuck and don't even quite know how to language this.
Imagine I have two boxes; one has a width of 3/4 of the whole, and the other is the remaining 4th. They are side by side and initially have 0 height.
I fill box-1 (3/4) box with an object that is 100% wide and who's height is determined based on aspect ratio. So box-1 stretches to the height of this object and keeps it same width. Box-2 still has the same width (1/4th of the whole) and zero height. Using aspect ratio I want to create an object that will fill box-2 and match the height of box-1, but I can't figure out how to calculate said aspect ratio.
Specifically - the aspect ratio of the item in box-1 is currently 4.5:1 and using trial and error I got the heights to match with ~1.6:1 in box-2; but I have no idea if that is reliable or if it will work consistently.
Any help?
A Drawing:
