There are more men born than women, on average there are 105 men born for every 100 women. However due to the higher life expectancy of women than men the total ratio of women to men is closer to parity and according to the World Almanac the ratio was 101.3 men to 100 women in 2001
There currently isn't a ratio that determines the difference between single men and single women. Between the ages of 20 to 40, there are more single men than there are single women. By the time 50 is reached, the number begins to even out.
As of 1/1/10 according to the U.S. Census Bureau the global population totals 6,830,586,985. There are 3,440,026,139 men and 3,390,560,846 women. The sex ratio is 101.5. There are 49,465,293 more men than there are women.
The ratio 3 to 4 can be writtem 3/4 or .75. Divide the total of men by the ratio to find how many women there are, then add the two numbers to find the total of workers: 222 /.75 = 296 women. 222 + 296 = 518 workers.