4. (3 points) A right trapezoid, its top base is $60 \%$ of the bottom base. If the top base increases by 24 meters, it can become a square. The original area of the right trapezoid is $\qquad$ square meters.
【Answer】Solution: The original lower base of the right trapezoid is: $24 \div(1-60 \%)=60$ (meters); the original upper base of the right trapezoid is: $60 \times 60 \%=36$ (meters); the original area of the right trapezoid is: $(60+36) \times 60 \div 2=2880$ (square meters); Answer: The original area of the right trapezoid is 2880 square meters. Therefore, the answer is: 2880.