proportional in hours or minutes? Do you have a picture that illustrates the goal?
Resizing a graphic may not be easy, if possible. Creating a series of blocks respresenting hours or 15 minute increments may be easier.
Filemaker is not super strong as a calendar.
I always use list views to display appointments or events that have start and end times.
But to actually display as in a calendar is going to be hard in Filemaker.
Unless, like DavidAnders said you make pre-created time slots.
But that's also a pretty tricky setup.