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A beis kor (the area in which a kor, about 500-700 lb., of grain can be sown) is defined in halachah as 75000 square cubits. Rashi (to Kiddushin 60b, ד"ה בית כור) points out that this is a square a bit more than 273 5/6 cubits to a side (and indeed, √75000 ≈ 273.86).
