You use for with `every' when you are stating a ratio, to introduce one of the things in the ratio.
For every farm job that is lost, two or three other jobs in the area are put at risk...
1)Does "farm job that is lost" mean "a job a person was dismissed from" or "a type of job that ceased to exist" ?
2)does "the area" mean here:
"a region or part of a town, a country, or the world"
farming industry on the whole