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Parashas Noach · Ark dimensions · Passuk 6:15
And this is how you shall make it: the length of the ark three hundred cubits, its width fifty cubits, and its height thirty cubits.
Bereshit Rabbah / classic mefarshim on the proportionality and capacity of the ark.
Sefaria — Genesis 6:15 with commentary
English: “Three hundred cubits…” — The dimensions of the ark were given with precision so that it would contain all the creatures.
Custom (significance of the given dimensions).
The ark’s measurements were not arbitrary; they ensured capacity for the full complement of creatures commanded to enter.