What was 400 francs worth in US dollars in 1890?

In 1890, the exchange rate between the French franc and the US dollar was approximately 5 francs to 1 US dollar. Therefore, 400 francs would have been equivalent to 80 US dollars in 1890. It's important to note that exchange rates fluctuate over time due to various economic factors, so this conversion is specific to the year 1890.