A vector has magnitude same as that of \( \vec{A} = 3\hat{i} + 4\hat{j} \) and is parallel to \( \vec{B} = 4\hat{i} + 3\hat{j} \). The x and y components of this vector in first quadrant are \( x \) and \( 3 \) respectively were \( x = \) ______.
