Financial analysis using ratios is one of the most used tools in business evaluation. When well informed analysts use ratios, it is supossed that high quality results are produced using low computing requirements. Usually, ratios use accounting information to perform an analysis in two ways: single or sets of ratios; is in the last stage where the knowledge and additional information about the business would difference a good ratio from a bad one. This paper tries to include both accounting and fuzzy information provided by experts about the profitable ratio, in order to obtain an adjusted profitable margin fitted by a fuzzy logic system.