The triangles are similar, and the following ratios of the lengths of corresponding sides are equal:
PQ/XY = PR/XZ = QR/YZ
The only pair of corresponding sides whose lengths we know is PQ and XY, so we must use it every time to establish a ratio. We will use PQ/XY both times below.
X = -675 I hope this helps! :) Solve for x, distibutive 0.2:0.2x - 540 Subtract 0.2x to each side: -540 = x - 0.2x Combine x: -540 = 0.8x Divide 0.8 to each side: x = -540/0.8 = -675