Find the three arithmetic means between 4 and 16.

7, 10 and 13.

Step-by-step explanation:

If there are 3 means between 4 and 16 then:

16 is obtained by adding the common difference 4 times:

(16 - 4) / 4 = 12/4 = 3 = common difference.

So the 3 arithmetic means are 4+3, 4 + 2*3, 4 + 3 (3)

That is 7, 10 and 13.