He reasoned out the conclusion according to the theory.

他根据这个理论作出了结论。

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He reasoned the problem out and came to a conclusion.

他对这个问题加以分析之后得到了结论。

youdao

He reasoned then that the charge, since he could vary voltage continuously but got a discontinuous variation in velocity, his conclusion was that the charge must be discontinuously attached to the droplet.

他推断出电荷，因为他可以不断地改变电压,但是得出了速度是在不连续变化着，他的结论是电荷,是间断地依附于液滴上的。

麻省理工公开课 - 固态化学导论课程节选

Generally you assume he or she will have a clear and balanced perspective, and will reflect on circumstances and come to a reasoned conclusion.

FORBES: Wise Leaders Guide Through Change