Hey there!
Ratios can be written in 3 forms, as follows.
x to y
x:y
[tex]\frac{x}{y}[/tex]
So, we will begin by writing your problem's ratio in the fraction form, and simplifying:
[tex]\frac{16}{4}[/tex]
Simplified, this is:
[tex]\frac{4}{1}[/tex]
So, we can take this new ratio and write it in the 3 forms:
4 to 1
4:1
[tex]\frac{4}{1}[/tex]
Have a terrificly amazing day!
