Mr Blenkinsopp was last seen three weeks ago when he walked a friend home to her house in Wanneroo.
Traces of his blood were later found near his home.
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A 45-year-old man from Ridgewood, a 42-year-old woman from Wanneroo and a 37-year-old man from Eden Hill have been charged with murder.
A 38-year-old woman from Morley has been charged with being an accessory after the fact to murder.
A fifth person is currently in custody in Kalgoorlie and the 53-year-old man is being questioned by police.
Detectives have also been searching an area of bushland in Gnangara pine plantation in Perth’s northern suburbs.
The WA Police Commissioner, Karl O’Callaghan, will not confirm media reports that Mr Blenkinsopp’s body has been found in a shallow bush grave.
“I haven’t been given any confirmation about that personally,” he said.
“I know that the detectives are up at a place in the northern suburbs doing some work earlier today but no-one has confirmed with me about the finding of a body at this stage.”
The searches follows a public appeal for help by Mr Blenkinsopp’s wife, Diana, earlier this week.
The four who have been charged are expected to appear in court in Perth tomorrow.
