1 inch = 2.54 cm
Set up this ratio
12 beads / 5 inches = 50 beads / x inches. worry about the cm later.
12/5 = 50 / x Cross multiply
12x = 250 This is not going to be very nice.
x = 20.833 inches. We better round this later.
Set up another proportion
1 inch / 2.54 cm = 20.8333 inches / x cm
1/2.54 = 20.833 / x
x = 2.54 * 20.8333
x = 52.92 cm. Now the question is what to do. He either needs to order 1 more bead or one less.
Place the order and see what the store manager says or obey what you've been told about rounding.
