The width of the actual book is 9 inches
The width of the image is 3 inches
The ratio of the width of the actual book to that of the image is
9/3 = 3/1
The ratio is 1:3
1) Therefore, the scale used for the image is 3:1
This means that 1 inch on the actual book is 1/3 inch on the image
The actual book is 3 times the image
2) Given that the height of the image is 4.5 inches, the height of the actual book would be
4.5 * 3 = 13.5 inches