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The volume of the rectangular prism is given as 90 ft^3. The length is given as 3 ft and the height is given as 12 ft.
We can use the formula V = lwh to find the width.
Substituting the given values, we have 90 = 3 * w * 12.
Simplifying the equation, we get 90 = 36w.
Dividing both sides of the equation by 36, we find w = 90/36.
Evaluating the right side of the equation, we have w = 2.5.
Therefore, the width of the rectangular prism is 2.5 ft.