import math


def list_values_approx_equal(num_list, rel_tol):
        """
        Check if all values in a list are within a relative tolerance of each other
        :param num_list: List of numbers
        :param rel_tol: The relative numerical tolerance
        :return: Truth value
        """
        for i in range(len(num_list)-1):
                for j in range(i, len(num_list), 1):
                        if not math.isclose(num_list[i], num_list[j], rel_tol=rel_tol):
                                return False
                        
        return True