How to find if right triangles are similar - SSAT Upper Level Quantitative

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Question

If a right triangle is similar to a right triangle, which of the other triangles must also be a similar triangle?

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Answer

For the triangles to be similar, the dimensions of all sides must have the same ratio by dividing the 3-4-5 triangle.

The 6-8-10 triangle will have a scale factor of 2 since all dimensions are doubled the original 3-4-5 triangle.

The only correct answer that will yield similar ratios is the triangle with a scale factor of 4 from the 3-4-5 triangle.

The other answers will yield different ratios.

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