I would like to create a 5-sided pan with a sloped bottom.  The tops of the four side flanges should be level, but the bottom should slope from one end to the other.  I have atttached a simple sketch of what I am looking for.

I was able to do this using trigonometry by creating a base flange for the left side, the creating an edge flange to be the bottom with a bend angle less than 90, and then creating the right side by adding an edge flange with bend angle greater than 90.  The front and back flanges need to have an edited profile to get them to come out correctly.

Is there an easier way to do this?  It seems like my method is almost more effort than it is worth.