You may be able to connect with the third born emotionally because they tend to be empathetic, sympathetic and caring. This relationship may be uncomfortable for you if your partner is given to unpredictable behavior, as many third borns are. They may also be insistent on correcting personal faults of your's such as smoking, working late or not being sympathetic enough with the children. You may provoke jealousy in the third born when you relate to others of the opposite sex. The fourth born is attentive, supportive, caring and understanding.
Fourth borns can be exceeedingly charming.
After marriage the relationship can continue to be good unless the fourth born harbors anger from the past. In that case, you could be entering an abusive relationship. This is a compatible relationship if you are male. You will probably enjoy your partner's expressions of feeling, her clarity about what she wants and her allowing you to do what you want. On the other hand, if you are female you could find the only to be exasperating.