Motive is a synonym of Motor. Motor is related to Inside. 
you are likely to find Floor in/at/on Desk. you are likely to find Dirt in/at/on Floor. Dirt is related to Vacuum. 
Motive <--Synonym--> Motor <--RelatedTo--> Inside 
Desk <--AtLocation-- Floor <--AtLocation-- Dirt <--RelatedTo--> Vacuum 