Finding ratio of areas of similar triangles

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Find the ratio of the areas of triangles $XOY:XOM:MON$.

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I'm able to find the ratio of $XOY$ and $MON$ using the similar triangle formulas, which makes it $4:25$. Unsure about $XOM$. Any help is appreciated.

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Hint: (1) What is $XO:ON$ (or $MO:OY$)? (2) Triangles $MOX$ and $YOX$ have different bases but the same height. Why is the ratio of their areas the same as the ratio of their bases?