To find the actual width of the banner in feet based on the scale provided, you can use the scale of 1 inch equals 3 feet.
Since the width of the banner in the scale drawing is 4 inches, you can calculate the actual width as follows:
\[ \text{Actual width} = \text{Scale width} \times \text{Scale factor} \]
Plugging in the values:
\[ \text{Actual width} = 4 , \text{inches} \times 3 , \text{feet/inch} = 12 , \text{feet} \]
Therefore, the actual width of the banner is 12 feet.