Screen size with 4 metre projector throw?

[Visionist]

I've been measuring my allocated screening room and the maximum distance I can mount the projector once soundproofing is complete is 400cm from the screen; as in, the projector lens will sit at around that distance.

How big of a screen does this give me in general? I suppose it varies from projector to projector, and whether one uses an anamorphic lens. I won't be going for a constant image height as I love films with IMAX scenes which open up. I'm hoping for a 150" 16:9 screen although this might prove ambitious at that distance.

Also, at my seating distance of ten feet, would a 1080p resolution on a 150" screen look good? Or should I wait for 4K to become affordable?