The arithmetic sequence is .

Now we can find the common difference d by subtracting two consecutive terms.

Now add  to the third term of the sequence , and then continue adding until the next four terms are found.

The next four terms of the sequence are 5.5, 5.1, 4.7 and 4.3.

The next four terms of the sequence are 5.5, 5.1, 4.7 and 4.3.