Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Rank | Margin | Club | Opponent | Year | Round | Venue |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | 190 | Fitzroy | Melbourne | 1979 | 17 | VFL Park |
| 2 | 186 | Geelong | Melbourne | 2011 | 19 | Kardinia Park |
| 3 | 178 | Collingwood | St Kilda | 1979 | 4 | Victoria Park |
| 4 | 171 | South Melbourne | St Kilda | 1919 | 12 | Lake Oval |
| 5 | 168 | Richmond | North Melbourne | 1931 | 2 | Punt Road Oval |
| Source: . Last updated: 20 August 2013. | Source: . Last updated: 20 August 2013. | Source: . Last updated: 20 August 2013. | Source: . Last updated: 20 August 2013. | Source: . Last updated: 20 August 2013. | Source: . Last updated: 20 August 2013. | Source: . Last updated: 20 August 2013. |
Question:
which round has a margin of 178?
Answer:
4.0