a question related least common multiple

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$ 1, 3, x, 15, y, 75$

These above six numbers are divisors of a number $z$, and these numbers are ordered from the least one to the highest one.

How to find numbers $x, y, z$?

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Since $15$ divides $z$, $5$ also divides $z$. Since $75$ divides $z$, $25$ also divides $z$. Thus $x=5$ and $y=25$. That yields the list of all divisors of $75$, so $z=75$.