Identify the next term in the following number series:
220, 284, 356, ?

Let us find the difference between the consecutive numbers in the series:
* $284-220=64$
* $356-284=72$

Notice the pattern in the differences: the difference increases by $8$ each time ($64,72,\dots$).
Therefore, the next difference should be:

$$72+8=80$$

Now, add this difference to the last term to find the missing number:

$$\text{Next term}=356+80=436$$