Thank you all for the excellent answers.

I was not aware of the different exchange rates. The reason I am using Bitcoin is to find out more about it, so I just learned a lot.

HCP said:

    "...0.00022977 going to what is probably a change address of coinbase..." is this some kind of fee?

I checked the transaction at 2017-05-21 18:35:11.

Are you saying that the market moved enough during the transaction to cause me to get less?

Sent $100 from Coinbase to Blockchain. On the send end, I was charged $1.54 miner's fee. So, a total of 101.54 was deducted from the account. Transactions were quickly verified (within 5 minutes)

ON the receive end, I got $97.83 in my Blockchain account, so $2.17 was missing.

I repeated the transaction a few minutes later, this time $2.57 was missing

One of the transaction ID's was 51c090f1081687bf0b6ce8fbda28ecbaf61f88b70eb24eee4e368bd4c74e1d02

(I am only using the web versions of these applications)

What happened to the $2.17 and the $2.57?