rails 3 - SQL pass variable to "order" -

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I'm trying to pass the variable in order ... 

  [code ] .order ([(Prices.Price *?) + Profile .PippingCost), Parameter [: Prod_ID]]. All   
 but this variable does not convert to SQL in exchange, it gives me (In this case the variable was "1").  
  Group by Price Order by SUM (Prices.Price *?) + Profiles.shippingCost), 1):   
 Is this possible?   
 
 
 You can:  
  [code] .order ( "SUM (prices.price * # {params [: prod_id] .to_i}) + profiles.shippingCost)". All.

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