indeed, such arbitrary comparisons can be made, as was pointed out already, you might as well example the bitcoin to xbox ratio or the bitcoin to hyundai ratio
I am speaking quantitatively, the ratio is rather arbitrary and meaningless. It would be different if
a) bitcoins could be measured in troy ounces
b) there were an equal number of troy ounces of silver in the world as total number of bitcoins
or perhaps c) the market cap of the two are equal