I think it’s a great question. To the posters that suggest you “follow the qrh procedure”, I would point out that none of the 3 Boeings I have flown have any checklist for this. Maybe some aircraft types have a specific checklist. But without one, it comes down to systems knowledge. It happened, not to me, but on a company 767 and they found in their situation that turning one pack off was enough to reduce airflow to allow the cabin to descend at the appropriate rate. I would imagine they may have had to adjust the aircraft vertical speed to keep the appropriate cabin differential.