Actually, you're missing part of the situation. The bowl in question was:
1 Kings 7:23 He [Solomon] made the Sea of cast metal, circular in shape, measuring ten cubits from rim to rim [diameter = 10] and five cubits high. It took a line of thirty cubits to measure around it. [circumference = 30].
There are many possibilities as to why the bowl didn't have the exact proportionality of pi. First off, it is probable that the diameter was measuring from the indide of the bowl to the other inside rim, and the circumference of 30 was measuring around the outer rim; these were appreciably thick bowls, so this is probably the answer.
Just remember..."Do not be deceived, God is not mocked; whatsoever a man soweth, that shall he also reap."
-- (September 23, 2003) on Pi Day 2000 (March 14, 2000, Mayan Calendar)