expression, noun-modifying (irregular)
logical; reasonable; self-consistent
Describes an argument, explanation, or action that follows a clear, rational line of reasoning, often with a moral or principled dimension.
彼の説明は筋道の通ったものだった。
His explanation was logical and consistent.
筋道の通った考え方をする人だ。
He is a person who thinks in a reasonable, principled way.
理にかなった also means 'reasonable' or 'logical', but is more neutral and does not carry the moral/principled nuance of 筋道の通った.
Phrase composed of 筋道 (reasoning, logic) + の (possessive particle) + 通った (past form of 通る, 'to go through'), literally 'through which reasoning has passed', i.e., logically consistent.