To find the ratio of 16 to 128, you can simplify it by dividing both numbers by their greatest common divisor (GCD).
The GCD of 16 and 128 is 16.
So the ratio of 16 to 128 can be simplified as follows:
\[ \frac{16}{16} : \frac{128}{16} = 1 : 8 \]
Therefore, the ratio of 16 to 128 is \(1:8\).