Calculating value of a cryptocurrency portfolio

Question

If I have a number of different cryptocurrencies and their current exchange rate in both bitcoin and USD, would this be true?

portfolio balance in bitcoin == portfolio balance in USD / bitcoin to USD exchange rate

The reason I ask is that I am doing this calculation on a current portfolio and these two values don't match.

Answer 1

watch the fraction:

portfolio balance in bitcoin == portfolio balance in USD / bitcoin to USD exchange rate

the units should be

bitcoins = dollars x (bitcoins/dollars) 

this way the dollars cancel out.