The last 7 days of posts received a total of 2078572 upvotes & 18174 downvotes.
The 5000 largest downvotes (with a total value of $10887 HBD) were processed.
These downvotes are equal in value to 3.5% of the $306912 HBD value of the pending rewards pool for posts.
That is the current rewards fund.
I am quite sure that your calculations are wrong. PArt of the reason is that you are only calculating half of the value - so, you are saying that the vote is worth for example "100", but forgetting that a post reward is calculated in HBD AND HIVE. This is important - but if you don't understand why, you probably aren't going to get your calculations right next time either.
As far as I am aware, from my study of the global parameters on the blockchain - based on various sources of documentation (none of which are verbose or totally clear) - the figure you have pasted here is for the total rewards fund, including the inflation that goes to the worker proposals and witnesses.
The figure I have used is the one labelled 'pending rewarded vesting' which I have then split according to the percentage in the global params that denotes how much is awarded only to authors of content. I am open to being wrong in my use of these parameters because I have never seen them fully documented anywhere in a way that leaves nothing to the imagination - but I am not seeing that demonstrated in your comments here.