Career is related to Ambition. Ambition is related to Enthusiasm. Enthusiasm is a type of Excitement. 
Proportion is etymologically related to Portion. Portion is related to Slice. Slice is a type of Strike. 
Career <--RelatedTo--> Ambition <--RelatedTo--> Enthusiasm --IsA--> Excitement 
Proportion --EtymologicallyRelatedTo--> Portion <--RelatedTo--> Slice --IsA--> Strike 