yum --nogpgcheck localinstall ImageMagick-6.9.0-0.i386.rpm

Error: Package: ImageMagick-6.9.0-0.i386 (/ImageMagick-6.9.0-0.i386)
           Requires: libltdl.so.3

repoquery -q -f */libltdl.so*

libtool-ltdl-0:2.2.6-15.5.el6.i686
yaf-0:1.3.2-1.el6.rf.i686
libtool-ltdl-devel-0:2.2.6-15.5.el6.i686

yum install yaf-0:1.3.2-1.el6.rf.i686
yum install libtool-ltdl
yum install libtool-ltdl-devel-0:2.2.6-15.5.el6.i686

Package ... installed and latest version