Leading by 4Ã‚Â½ matches overnight, Queensland now leads by a contest and six matches as their home state advantage continues to pay dividends.
Tim Hart, Brett Rankin and Chris Wood were among a host of Queensland winners in the fourth round.
Victoria holds second place comfortably following their 7Ã‚Â½ to 3Ã‚Â½ victory over Western Australia. Leading 3-1 from the morning foursomes, the Victorians benefited from several squared matches to open a nine match gap to New South Wales and South Australia who are tied in third place.
South Australia claimed a narrow 6-5 victory over Tasmania to match New South Wales on the leaderboard.
Australian Boys' Amateur champion Anthony Murdaca won both his foursomes and singles matches for South Australia in the win.
Tasmania is in fifth place following the loss while Western Australia is in sixth.
Source - Golf Australia