Ratio is the classification of sensory sensed stimuli and typify that on the basis of threatening, safe, positive, negative, good, evil, constructive, destructive, etc. In other words, is the perception of sensory stimuli rational grouping and linking that to chemical substances and circumstances and procedurally record this in the memory.
Listening to your ratio is to include the previously established links in your current considerations and future choices.
To be guided by your ratio and/or that of others, is to make your considerations and choices subordinate to rational links of yourself and/or others, based on previous circumstances, current events and future developments.