The whale, which weighs 30-tonnes was found on Central Beach in Skegness on Sunday, two smaller calves were discovered the same day on another beach in the area.
On Saturday another 50ft sperm whale, thought to belong to the same pod, died after becoming stranded on a Norfolk beach.
The body of a fifth whale washed up on Monday afternoon on another Lincolnshire beach.
The whale, which is also believed to be from the same pod, was found at Wainfleet, the Maritime and Coastguard Agency reported.