There are 305 Conservative MPs.
Some 290 MPs voted against an investigation into Jeremy Hunt.
Had the 57 Liberal Democrat MPs voted for the investigation, the motion would have carried.
As it was, they were instructed to abstain, and only 252 MPs backed the proposal.
MPs voted by 290-252 against a Labour motion calling for an investigation into Jeremy Hunt's handling of the BSkyB takeover bid.
Nick Clegg has laid bare a coalition rift by revealing that he wants the PM to launch a probe into Jeremy Hunt's handling of the BSkyB bid.
The Liberal Democrat leadership has asked its members to abstain in a debate over Jeremy Hunt's behaviour during the BSkyB bid process.