The allowable stress (S) on a post is S=3ED210L2. S = allowable stress measured in pounds per square inch (PSI), D = dimension of the post measured in inches, L = length of the post measured in inches, and E = elasticity of the beam measured in pounds per square inch (PSI). Find the dimension of a post rounded up to the nearest whole number, if S = 430, E = 1,600,000, L = 102. The dimension of the post is
