The Cats will host a preliminary final at the MCG in a fortnight after belting the Power 20.18 (138) to 7.12 (54) at Adelaide Oval on Thursday night.
Port are pitched into a home knockout semi-final against the winner of the Western Bulldogs' elimination final against Hawthorn on Friday night.
The Power face the prospect of a so-called straight-sets exit from the finals for a second year in a row and have concern over midfield ace Zak Butters, who was substituted because of a rib injury.
The Cats, with Stengle and Cameron kicking four goals each, dished out the second-biggest finals defeat to Port despite the late withdrawal of five-time All Australian Tom Stewart.
Stewart, suffering a hamstring injury, was substituted out of his side's round 24 thrashing of West Coast, though the Cats say he was scratched from the final because of illness.
Star Geelong forwards Stengle and Cameron combined with Shaun Mannagh (three), Gryan Miers (three), Shannon Neale (two) and Jack Bowes (two) to overwhelm a lacklustre Port.
Geelong's Tyson Stengle was a constant threat to the Port Adelaide defenders. (Matt Turner/AAP PHOTOS)
Cameron's first two goals defied football logic. Five minutes into the game, the key forward collected a handball running towards a boundary line and, a step inside the paint, curled a remarkable snap through from 30 metres.
In the second term, the four-time All-Australian kicked another stunner: using the outside of his left boot, he dribbled through from near the boundary line.
Cameron's teammate Max Holmes was superb - his 28 disposals featured five inside-50s and also seven rebound-50s - while captain Patrick Dangerfield (24 touches), Zach Guthrie (27), Miers (21) and Mannagh (23 disposals) were prominent.
Port briefly hit the front in the second term but then meekly conceded 10 of the next 11 goals and were held goal-less in the third quarter.
Midfielder Ollie Wines (23 touches), Ryan Burton (21) and Willem Drew (21) were the home side's main ball-winners.
Star trio Butters, who had just eight disposals before being subbed, captain Connor Rozee (16 possessions, one goal) and Jason Horne-Francis (18, one goal) were all subdued.
Geelong set the tone with a dominant opening 20 minutes, but two late goals by Port reduced the visitors' advantage to three points at quarter-time, 3.7 to 3.4.
Port took the lead nine minutes into the second stanza but held it for just a tick over a minute as the Cats embarked on their scoring spree.
Geelong booted the next five goals to craft a 20-point half-time advantage, 9.9 to 6.7, then punished Port with 5.7 to 0.2 in the third term.
The Cats led 14.16 (100) to 6.9 (45) at three-quarter-time before cruising to victory.
Port''s only bigger finals loss is their 119-point drubbing from Geelong in the 2007 grand final.
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