What is the relation between Pratītyasamutpāda and Four Noble truths? First two truths are relate to "samsara". But how 3rd and 4th truths relate to Pratītyasamutpāda?
If we divide Pratītyasamutpāda to three existences it's much easier to explain. (this can be explained for each moment as well) 


  First existence
   1. Ignorance 
   2. Formations
  Second existence
   3. Consciousness  4. Nāma-rūpa   5. The six senses   6. Touch    7. Sensation
   8. Craving
   9. Clinging
  10. Becoming
  Third existence
   11. Birth
   12. Old age and death



If we take second existence as the current life, points 3, 4, 5, 6, and 7 (consciousness,  nāma-rūpa,  the six senses,  touch and sensation) are another form or representation of the five aggregates which is same as suffering or the first noble truth.
If you crave for the sensations (nourished by ignorance) in this existence, then this will form your next life. Although craving, clinging, becoming, ignorance and formations in this life are all causes for the next life, craving is the main culprit, hence craving becomes the second noble truth. 
If craving is ceased in this very life, there won't be another existence,that means you've overcome the suffering, this can be achieved and has been achieved, hence this becomes the third noble truth.
To realise this, you have to follow the eightfold path, which is the fourth noble truth. However, Pratītyasamutpāda doesn't straight away relate to the fourth noble truth as the other three here.