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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.

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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.
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