5 out of 19 marbles are yellow so the remainder which is 19-5 = <<19-5=14>>14 marbles are blue and red
14 marbles are split into blue and red in the ratio 3:4 so each "share" is 14/(3+4) = <<14/(3+4)=2>>2 marbles
There are 4 "shares" of red marbles which totals to 4*2 = <<4*2=8>>8 red marbles
There are 8-5 = <<8-5=3>>3 more red marbles than yellow marbles
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