| ( | X | + | 451 50 | + | 219 25 | + | 479 50 | ) | ÷ | 4 | = | X |
| 方程左边 = | X | × | 1 4 | + | 451 50 | × | 1 4 | + | 219 25 | × | 1 4 | + | 479 50 | × | 1 4 |
| = | X | × | 1 4 | + | 451 200 | + | 219 100 | + | 479 200 |
| = | 1 4 | X | + | 171 25 |
1 4 | X | + | 171 25 | = | X |
1 4 | X | − | X | = | - | 171 25 |
| - | 3 4 | X | = | - | 171 25 |
171 25 | = | 3 4 | X |
3 4 | X | = | 171 25 |
| X | = | 171 25 | ÷ | 3 4 |
| = | 171 25 | × | 4 3 |
| = | 57 25 | × | 4 |
| X | = | 228 25 |
| X | = | 9.12 |