need help calculating ratios

[SMcNeill]

For ratio 1:1 with 16 items, it should be 4 rows, 4 columns, but it calculates 8 rows, 8 columns. 
For ratio 3:4 and 12 items, it should output 4 rows, 3 columns, but we get 5.142857 rows, 6.857143 rows.

SQR(Num * Ratio)
SQR(16 * 1/1) = 4
SQR(12 * 3/4) = 3, SQR(12 * 4 /3) = 4