Sales at Guitar Center Inc. rose nearly 20 percent to $562 million on a consolidated basis for the fourth quarter ended Dec. 31, the company said. Sales at Guitar Center store sales open at least a year rose 4.6 percent for the same period. Sales at new stores contributed $30.6 million to the company’s fourth quarter store sales, which totaled $409.9 million. Fourth quarter 2005 sales reflect the combined operations of Music & Arts Center, acquired in April. Guitar Center executives noted that the performance was within the range of the company’s previous guidance. Full results for the quarter will be reported on February 15.