Let $\mathrm{P}(4,4 \sqrt{3})$ be a point on the parabola $y^2=4 \mathrm{ax}$ and PQ be a focal chord of the parabola. If M and N are the foot of perpendiculars drawn from P and $Q$ respectively on the directrix of the parabola, then the area of the quadrilateral PQMN is equal to :
