If I did a design on graph paper measuring 8.5 by 11inches and need to provide them with actual measurements of the design that measures 255 in by

If I did a design on graph paper measuring 8.5 by 11inches and need to provide them with actual measurements of the design that measures 255 in by 330 in what is my ratio for the calculations? My first measurement is a square with the coordinates of 0,16 and 16,0. The assignment is call Geometry Similar Polygons Assignment.