This is the 16268th most frequent Russian word.
рационального
"Рационального" means "rational" or "logical" in English.
Here, 'рациональное' is used as an adjective, modifying the noun 'решение', to describe a solution that is reasonable and based on logical thinking.
Он предложил рациональное решение проблемы.
He suggested a rational solution to the problem.
'Рационального' serves here again as an adjective, now describing 'подход', which means approach, emphasizing a sensible and systematic method.
Она стремится найти рациональный подход к обучению.
She strives to find a rational approach to learning.
In this context, 'рационального доводов' highlights logical and well-reasoned arguments, emphasizing the character of the points used in discussion.