78/84 as a percentage is 92.86%. This value tells you how large 78 is compared to 84 when both are expressed on a scale of 100.
In everyday terms, a 92.86% score means you are very close to the full amount. If you think of a pizza cut into 84 slices, having 78 slices would cover almost the whole pizza.
Remember that percentages like this are useful for quickly comparing parts to wholes, whether in school grades, sports stats, or simple everyday calculations.