Mixed metric 3-contact manifolds and paraquaternionic K\"ahler manifolds

We study manifolds endowed with mixed metric 3–contact structures, proving that the distribution spanned by the Reeb vector fields is integrable, with totally geodesic integral manifolds, of constant sectional curvature $k=\pm 1$. We also prove a result of projectability of such structures onto paraquaternionic K"ahlerian structures.