In the case of the standard required gradient, your aircraft should be able to make it with one engine inoperative. In the case of a higher-than-standard required gradient, well.....maybe yes, maybe no
This is NOT a guess game,it is a regulation.By JAA for sure.
If you fly 737,you must calculate your Go around climb gradient using the 'DISPATCH PERFOMANCE' provided by Boeing in the FCOM.
It is for the case when the go around climb gradient is higher than the standard (2.4%)(2 engines jet).
If your Minima say 4%, you must ensure that you can do it by CALCULATING it using the above performance tables.
First, you can increase your DA, thereby giving your aircraft a 'head start' for the climb. For example, on an ILS with the typical 200 foot DA, you might increase your DA to 1000 feet.
Again,this is NOT a guess game.The RVR used with the DA must be followed,so if you put a DA of 1000ft,you wont see the runway anyway if you have the minimum DA RVR.
For example,4% gradient on the plate shows 300ft DA/RVR 800 but 2.5% gradient shows a DA of 200ft and RVR550, you cant legally start the approach with lets say with 600 RVR if you cant achieve the the 4% gradient.
If you have terrain during the go around and a standard missed approach is not possible,an escape route MUST be provided by Jeppesen and your company for you to follow.(example INNsbruck).