This is the 16269th most frequent Russian word.
рациональным
"Rational" or "reasonable."
The word 'рациональное' describes 'решение' (decision) as logical and reasonable.
Это рациональное решение.
This is a rational decision.
The word 'рациональным' describes the behavior of a person as logical or practical.
Он всегда старается быть рациональным в своих действиях.
He always strives to be rational in his actions.
The word 'рациональный' describes the approach as based on reason and logic.