Hooker Charles Tarau and standoff Kyle Hool each added a brace during the clinical effort inside Portland's half.
Richie Levita, Taine Shelford, Nic Poutama and Wi Thompson also crossed the line in the 11-try romp.
Takahiwai's attacking masterclass showed they have the ability to make a third trip to the grand final in as many years.
Meanwhile, Moerewa Tigers added another half century of points as they thrashed Northern Wairoa Bulls 60-4.
The Moerewa attack looked every bit as ominous as they did during their 2017 RLN Premiership run, scoring at will while forcing multiple mistakes out of the home side.
In the final game of the round, Otangarei Knights made it four from four as they beat Hora Hora Broncos 34-4.
Otangarei defending resolutely throughout the entire 80 minutes and put on a strong showing at the other end as they dispatched of a willing Hora Hora side.
Next week should bring about the end of one of the unbeaten streaks still active in the RLN Premiership as Moerewa host Otangarei.
In the other matches, Takahiwai has the opportunity to keep reducing the gap between themselves and the top two sides when they take on an improving Hora Hora outfit while Portland and Northern Wairoa have a chance to reverse their round four fortunes when they face each other.
Results:
Takahiwai Warriors 56 Portland Panthers 22, Moerewa Tigers 60 Northern Wairoa Bulls 4, Otangarei Knights 34 Hora Hora Broncos 4.
