You're confusing GDP with GDP per capita, and also 350,000,000 / 1,460,000,000 = 0.23972602739 and to convert that to a percentage you multiply by 100 so you get 23.973% as the result.
The number from wikipedia was 146 Billion (26 Austin-Round Rock, TX 146,784 metropolitan statistical area in millions of dollars) if you looked at the link I gave. Which is 146,784,000,000, though you could argue the city is a smaller area. Remember, thousand 3 zeros, Million 6 zeros, Billion 9 zeroes.
The GDP per capita was simply a sanity check showing how 1.4B must be wildly wrong.
The GDP per capita was simply a sanity check showing how 1.4B must be wildly wrong.
https://en.wikipedia.org/wiki/List_of_U.S._metropolitan_area...