I’ve seen you post that same thing over and over.
Under the Coinage Act of 1792, here’s the deal:
A gold eagle (ten dollars) contains 16 gr of pure gold.
That makes one dollar the equivalent of 1.6 gr pure gold.
A dollar contains 24.1 gr of pure silver
Therefore, 24.1 gr of silver is the equivalent of 1.6 gr of gold
24.1 divided by 1.6 gives a ratio of 15.06 to one
Which is close to their relative rarity in the Earths crust.