We observe that 256 and 127 have a relationship. Let's look at the relation between 256 and 127:
We can check if the digits of 256 and 127 have any arithmetic relationship:
\[
\frac{256}{2} = 128, \quad 128 - 1 = 127
\]
So, the relationship between 256 and 127 is that we divide 256 by 2 and subtract 1.
Now, applying the same pattern to 378:
\[
\frac{378}{2} = 189, \quad 189 - 1 = 188
\]
Thus, the answer is 188. Therefore, the correct answer is (4) 188.