900x300=270,000 plus 2 would equal 270,002.4 devided by 3-2001 would equal 87,999.8
So if we take 1/4 to be the 100%, what is 2/3 in percentage off of it then?

yes, is a large value, because 2/3 is indeed larger than 1/4, more than twice as large.
The answer is
*6.340338097E53