With a try bonus-point also achieved, the Scots claimed the required five points that sets up a crunch clash with Japan on Sunday - weather permitting.
It could all be for nothing however due to a typhoon that threatens Sunday's meeting with the hosts.
Two Saturday games have been cancelled and declared draws on safety grounds as Typhoon Hagibis closes in and a repeat on Sunday could eliminate Scotland.
Gregor Townsend's side must defeat hosts Japan in Yokohama to have a chance of staying in the competition.
"We've been told now that Sunday looks clear," Scotland's head coach said.
"Saturday is the day the typhoon comes in and it comes through quite quickly."
Scottish Rugby has called on World Rugby to devise "contingency plans" to protect the integrity of the competition in the event that the Pool A fixture cannot go ahead in Yokohama.
A final decision will not be made until the morning of Sunday's match, seemingly ruling out any rescheduling.