aspect ratio 1:2.35

I was wondering how to get a 1:2.35 aspect ratio layout. What resolution numbers do I have to put in to get this size?

The aspect ratio describes the ratio of width to height. This means that
the width needs to be 2.35 times the value of the height. In order to
determine the resolution numbers to put in, you need to know the size
of either the width or the height in addition to the aspect ratio.