Question 174091
The area of a triangle is given  by {{{A = bh/2}}}

If you know the triangle is a right triangle, then you can just use the two 'shorter' sides. Let the shortest side be b and the middle length side be h.

You are given that the sides are in ratio x:4x-1:4x+4
So the longest side is 4x+4
That makes the short side, b = X = 3
The middle length side, h = 4x-1 = 12-1 = 11

{{{A = bh/2}}}
{{{A = (3*11)/2}}}
{{{A = 33/2}}} square units (whatever units x is in (the problem doesn't say