  We study supersymmetric $AdS_4$ black holes in matter-coupled $N=3$ and $N=4$
gauged supergravities in four dimensions. In $N=3$ theory, we consider $N=3$
gauged supergravity coupled to three vector multiplets and $SO(3)\times SO(3)$
gauge group. The resulting gauged supergravity admits two $N=3$ supersymmetric
$AdS_4$ vacua with $SO(3)\times SO(3)$ and $SO(3)$ symmetries. We find an
$AdS_2\times H^2$ solution with $SO(2)\times SO(2)$ symmetry and an analytic
solution interpolating between this geometry and the $SO(3)\times SO(3)$
symmetric $AdS_4$ vacuum. For $N=4$ gauged supergravity coupled to six vector
multiplets with $SO(4)\times SO(4)$ gauge group, there exist four
supersymmetric $AdS_4$ vacua with $SO(4)\times SO(4)$, $SO(4)\times SO(3)$,
$SO(3)\times SO(4)$ and $SO(3)\times SO(3)$ symmetries. We find a number of
$AdS_2\times S^2$ and $AdS_2\times H^2$ geometries together with the solutions
interpolating between these geometries and all, but the $SO(3)\times SO(3)$,
$AdS_4$ vacua. These solutions provide a new class of $AdS_4$ black holes with
spherical and hyperbolic horizons dual to holographic RG flows across
dimensions from $N=3,4$ SCFTs in three dimensions to superconformal quantum
mechanics within the framework of four-dimensional gauged supergravity.
