If a musaafir joins the Jamaat after having missed three raka'ts, how should he complete the Salaat?

Answer

When a musaafir joins a Jamaat behind a muqeem Imaam (i.e. the Imaam is not a Musaafir), then the musaafir should perform the full four raka'ts with the Imaam. If the musaafir missed three raka'ts, he should perform the three raka'ts after the Imaam makes his Salaam to end the Salaat, in the same way that a muqeem will do.