The Zoning Board of Appeals may reverse or affirm, wholly or in part, or may modify any order, requirement, decision or determination appealed from and may make such order, requirement, decision or determination as in its opinion ought to be made in the premises and to that end shall have all the powers of the Zoning Administrator. The concurring vote of four members of the Zoning Board of Appeals shall be necessary to reverse any order, requirement, decision or determination appealed from or to decide in favor of the applicant on any matter on which it is required to pass, or to effect any variation in the requirements of this chapter. The grounds of every such determination shall be stated and recorded.