“Relatively Speaking,” the trio of Broadway one-acts by big-name scribes Woody Allen, Ethan Coen and Elaine May, will close at the end of the month.Show becomes the second to cut bait in the wake of the holiday B.O. boom (and ahead of the early-winter chill), following the recent announcement that struggling tuner “Lysistrata Jones” will close Sunday. “Relatively Speaking” initially pulled in healthy sales for a play, which don’t often log the razzle-dazzle numbers of crowdpleasing tuners. Show’s debut week topped $700,000, and for the next several seshes weekly tallies hovered between $650,000 and $750,000 per frame. With a cast that includes Steve Guttenberg, Julie Kavner, Mark Linn-Baker and Marlo Thomas, the show had no single toplining star, but the writers were seemingly high-profile enough to serve as a draw. Since late November, however, box office has declined. Last week, during the high-traffic frame between Christmas and New Year’s, the play pulled in about $450,000. So far the production has grossed $8.7 million since it began previews Sept. 20. Julian Schlossberg and Letty Aronson produce “Relatively Speaking” with co-producers Edward Walson, Leroy Schecter, Tom Sherak, Daveed D. Frazier and Roy Furman. Show shutters Jan. 29 at the Brooks Atkinson Theater.