Notice that the side 7 units long corresponds to the side 13 units long.
What number did you multiply 7 units by to get 13 units?
Use this same multiplier to calculate the new enlarged width.
Use 1.86 to find the new width of the rectangle.
5(1.86) = 9.3 units
Use the eTool below to help you better understand how scale factors work.
Click the link at right for the full version of the eTool: CC1 7-88 HW eTool