This pairing is one that rarely lasts as they are so different. The 4 focusses on building a secure and solid world whereas the 9 is far more based in more social and humanitarian instincts. For this couple to succeed it will require both to be aware of how each are different in their approaches. They must also find the will to accept each other’s ways. The 4 will appreciate the 9’s intelligence and knowledge, and the 9 must likewise value and appreciate the 4’s determination and consistency.