According to the Bank of England's inflation calculator page [1] 50 GBP in 1875 would be worth around 4,766 in today's Sterling. Not sure how to calculate the t

According to the Bank of England's inflation calculator page [1] 50 GBP in 1875 would be worth around 4,766 in today's Sterling. Not sure how to calculate the true "worth" of the exchange from GBP to USD, though. 50 GBP in 1875 would be around 320 USD (according to the Wikipedia article), does this mean that the 4,766 Sterling should be represented as 21,663 USD (according to the 1875 exchange rate) OR as 6,015 USD (according to today's exchange rate)? Not sure. [1]: https://www.bankofengland.co.uk/monetary-policy/inflation/inflation-calculator https://www.bankofengland.co.uk/monetary-policy/inflation/in...