Determine connections of a transformer based on resistance
You might want to look at Sam Goldwasser's FAQ on strobes and camera flashes- it's quite an extensive collection. With credit to Sam and the original author, here is a typical circuit: 



It appears your 3:5 is the drive coil and the high voltage and feedback windings are the remaining three pins with 2 the high voltage output. Up to you to figure out the phasing, and I'm not really sure from those measurements which end of the feedback coil goes where- try to use a higher resolution meter and take the measurements all at the same time (and temperature). 3 ohms is only about 1% of the high voltage winding...