51/98 as a percentage is 52.04%. This is the rounded figure you get when you express the fraction in terms of a whole number out of 100.
The fraction 51/98 tells you that for every 98 parts, 51 parts are taken. It’s a little more than half, which is why the percentage is just above 50%.
When you see 52.04% on a chart or a report, you know it represents the same relationship as 51 out of 98. The rounding to two decimal places makes it easy to read while still keeping the value accurate enough for most everyday uses.