The basic problem is: 1 2/3 yards (length) of 45-inch fabric (width) will be equal to how many yards (what length) of fabric that is 60 inches wide?
It would be the same amount of fabric in square inches,because you times the length by the width to get the square inches of the whole fabric,if you convert the yards to inches.
1 2/3 yards is 60 inches length,and 45 inches width.
So if the 60 inches switches to width,then the 45 inches switches to length.
It would be 1 1/4 yards length(45 inches)and 60 inches width.
If you wanted the same amount of fabric as long as it comes out to 2700 square inches by timing the length and the width,then it would be the same.
1 2/3 yards,60 inches length x 45 inches length=2700 square inches.
1 1/4 yards,45 inches length x 60 inches length=2700 square inches.