Analysing ranked data

#1
I had following question in my questionnaire:
Rank following factors: price, quality, advertisement, brand, reference from 1 (very important) to 5 (least important) that influenced on your buying decision process.
Which approaches may be used in order to measure most important factors?
I think cluster analysis would fit more but then i would have more problems by defining clusters. So, i am wondering is there any alternative approach to analyze it?