There are a plethora of synonyms for the phrase "be satisfactory." Depending on the context and tone desired, some options could include "meet expectations," "fulfill requirements," "suffice," "be acceptable," "be sufficient," or "pass muster." Other options might include more colloquial phrases such as "do the trick," "get the job done," or "fit the bill." When looking for synonyms, it can be helpful to consider the specific nuances of the phrase you are replacing. In the case of "be satisfactory," synonyms might focus on the idea of meeting a certain standard or level of performance, or on providing adequate fulfillment or benefit to those involved.