There was a dominant rowing display by the British men's four as they cruised into the final.
Alex Gregory, Moe Sbihi, George Nash and Constantine Louloudis were never in danger at the Lagoa, crossing the line 3.53 seconds ahead of second place.
Things did not go so well for Will Fletcher and Richard Chambers as they finished their semi-final in fourth, meaning they cannot secure a podium spot.
Britain competed in the first rowing final of Rio 2016, but a strong start to the men's quadruple sculls tapered off.
Rescheduled due to strong winds on Wednesday, Peter Lambert, Sam Townsend, Angus Groom and Jack Beaumont showed no ill effects in the early stages.
They were in bronze medal position after 500 metres but fell down the pack, eventually finishing fifth in six minutes 13.08 seconds - 6.27 secs behind winners Germany.
There was agony for Great Britain's Alan Sinclair and Stewart Innes in the men's pair final.
The Inverness-Henley combination took to the Lagoa in search of a podium finish and after a slow start were on course for just that.
Sinclair and Innes were third at the halfway point and in silver medal position entering the final 500 metres, only to be overpowered in the closing stages as they finished fourth.
Ireland, meanwhile, are celebrating having two crews in the final for the first time in Olympic history.
Gary and Paul O'Donovan finished third in the lightweight men's double sculls semi-finals after Sinead Lynch and Claire Lambe progressed to the women's event finale by also finishing third.
Jen McIntosh failed to qualify for the final of the women's 50m rifle three-positions event at Dedoro shooting range.
McIntosh finished 18th in the qualification round, with only the top eight competitors progressing to the final.
Britain have so far won two bronze medals in the shooting, courtesy of Ed Ling and Steven Scott.
Carl Hester showcased all his experience to recover from a mid-test setback as Great Britain's dressage team continued their medal quest in Deodoro.
Hester, who helped Britain win team gold at London 2012, posted a score of 75.529 per cent on Nip Tuck, keeping things together after the horse spooked and moved rapidly to Hester's left before he quickly regained control.
After Fiona Bigwood and Spencer Wilton posted scores of 77.157 per cent and 72.686 per cent, respectively, on Wednesday, Britain maintained third spot behind leaders Germany and Holland in second.
Reigning Olympic individual champion Charlotte Dujardin performs her first test of the competition later on Thursday.