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Triangle is similar to triangle .  

  1. Find the scale factor from triangle to triangle .

    Find the scale factor by using two corresponding sides.

    The scale factor is .

  2. Find .

    Divide by the scale factor.

  3. Find .

    Multiply the corresponding side by the scale factor.

Triangle, A B C, with labels as follows: Side, A C, 8, side, B C, x, and side, A B, 3.

Triangle, D E F, with labels as follows: Side, D F, y, side, E F, 38.5, and side, D E, 15.