Hex #378ba4 or rgb(55,139,164) in RGB space is the tint of bluish cian. It has hue angle of 193.76 degrees, value = 64 and saturation = 66. #378ba4 can be obtained by mixing 4 colors: 3 drops of magenta, 3 drops of blue, 5 drops of cyan, 3 drops of green.
Nearest safe hex - #339999. Below you can see the block with #378ba4 color and its structure: in procentage ratio and in drops of pigments. Click "TRY" button to move #378ba4 to the mixer and play with it.