Die türkischen Bürger sind mit einem guten Fünftel die größte Gruppe von Ausländern in Berlin.

[GooDDmann]

what does "mit einem guten Fünftel" mean here?

[nicolas_jk]

Approximately a fifth, and I think it implies more than a fifth, but I'm not really sure about that.

[ANDMAN2201]

That's right.
It usually translates to "more than a fifth". I'd say "at least a fifth" is fine aswell.

[mizinamo]

That's right.

gut ein Fünftel or ein gutes Fünftel is something like "a bit more than a fifth".

[GooDDmann]

thanks for the help anyhow :-)