Answer:
There is not enough information to determine the width of the TV. Given only the height of the TV, it is impossible to know the aspect ratio of the TV, which is the ratio of the width to the height.
A 90 inch TV could be a 4:3 aspect ratio TV, in which case the width would be 67.5 inches, or a 16:9 aspect ratio TV, in which case the width would be 52.5 inches.
Explanation: