Australia had entered the series on equal points with India at 111 but below Mahendra Singh Dhoni's side when ratings were calculated beyond the decimal point.
The series win gave it one ratings point which was enough to put it ahead of India.
England (116) leads the Test Championship table, followed by South Africa (116) which is fraction of a point behind Andrew Strauss's side.
Meanwhile, West Indies batsman Shivnarine Chanderpaul has regained the number-one ranking in the rankings for Test batsmen after hitting two half-centuries in the Dominica Test, which Australia won by 75 runs to claim the series 2-0.
No Indian figures in the top-20 list for batsmen while Zaheer Khan (12) and Pragyan Ojha (20) have maintained their rankings in the bowlers' list.
Chanderpaul scored 68 and 69 which earned him 19 ratings points and helped him to leapfrog South Africa