In order for the two figures shown below to be similar the length of the unknown side must be . If necessary round your answer to the nearest tenth.?

To determine the length of the unknown side for the two figures to be similar, you need to set up a proportion based on the corresponding sides of the figures. By comparing the ratiOS of the known sides, you can solve for the unknown side. If you provide the specific measurements of the figures, I can help calculate the unknown length.