The official company name is Dr. Ing. h.c. F. Porsche AG, usually shortened to Porsche AG
Volkswagen
Volkswagen AG
49% of Porsche AG is owned by Volkswagen as of fall 2009. Dr. Ing. h.c. F. Porsche AG (also Porsche SE) is a member of the Volkswagen Group. In the beginning of 2009 Porsche considered buying VW. VW then bought Porsche though. Dr. Prof. Ferdinand Porsche started Volkswagen during WW2. Volkswagen will be taking cars away from prodution soon. VW wants to take the Panamera away after a 7 years of sale. Volkswagen will also be adding cars to the line. Watch for the Roxster, Baby Boxster, Cayenne Hybrid, and new Cayenne with Volkswagen touareg touches. www.porsche.com www.volkswagen.com Porsche SE is the Parent Company. Dr. Ing. h.c. F. Porsche AG along with Volkswagen AG are subsiduaries of Porsche SE. Therefore Porsche are the owners
Volkswagen AG
Porsche AG bought Volkswagen in January.
Currently, Porsche owns no automotive companies. It is owned by the VAG (Volkswagen AG) group.
Agriculture
Lamborghini is owned by Audi AG, which is 99.7% owned by Volkswagen AG, which in turn is 30.9% owned by Porsche AG. Audi assumed ownership of Lamborghini in 1998. Basically, Lamborghini is owned by Audi, Volkswagen, and Porsche. The reason Lamborghini is owned by three companies is due to split-ownership.
The Porsche 924 was a sports car produced by Porsche AG. It was produced from 1976 (first production) until 1988, and was the replacement of the Porsche 914. In total about 150 thousand Porsche 924's were produced, including 5 different versions.
Silver
Porsche is a brand of luxury high-performance automobiles, rather than it being a type (as you called it, "the porsche"). According to the Wikipedia article (http://en.wikipedia.org/wiki/Porsche) Dr. Ing h c f. Porsche AG was founded in 1931 by Ferdinand Porsche, an Austrian born engineer.