What standing wave ratio results from connecting a 50-ohm feed line to a 200-ohm resistive load?
Why SWR from a purely resistive mismatch is just the ratio of the two impedances, larger divided by smaller: 200 / 50 = 4, written as 4:1. Because the load is resistive there is no reactance to complicate the calculation. SWR is always expressed with the larger value first, so it is never less than 1:1.
Watch out The inverted form 1:4 is not how SWR is written; SWR is by definition at least 1:1, so the bigger number always comes first. 2:1 would come from a 100-ohm load on 50-ohm line.
Divide big by small, never smaller than 1:1. 200/50 = 4:1.