US Dollar is 3.05x larger than Japanese Yen. This page compares the live size of US Dollar and Japanese Yen.
Relative size = Japanese Yen fx market cap / US Dollar fx market cap.
Fiat comparisons use money-supply and currency-rate based size metrics, so the result is a supply-scale comparison rather than a spot FX forecast.
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It compares US Dollar as Asset A with Japanese Yen as Asset B, using Japanese Yen fx market cap as the target size.
Relative size = Japanese Yen fx market cap / US Dollar fx market cap.
Direction matters. US Dollar with Japanese Yen's fx market cap is different from Japanese Yen with US Dollar's fx market cap because the starting price, supply, shares, or size metric changes.