A triangle with a perimeter of 69 units is the image of a triangle that was dilated by a scale factor of 4. Find the perimeter of the preimage, the original triangle, before its dilation. Round your answer to the nearest tenth, if necessary.
To find the perimeter of the preimage before its dilation, we need to reverse the dilation process with a scale factor of 4 by dividing the given perimeter of 69 units by the scale factor.
Perimeter of preimage = Perimeter of image / Scale factor
Perimeter of preimage = 69 / 4
Perimeter of preimage = 17.25
Therefore, the perimeter of the original triangle before its dilation was 17.3 units.