Related data model in Power Pivot

Question

I have about 4 data tables in my data model with each table related linearly. What I mean is that Table 1 is related to table 2, table 2 to table 3 etc. How can I access the related data in table 3 from table 1? I have attempted to add the required column to table 2 and back to table 1, unfortunately, it's not accessible. I can only see the content of table 2 in table 3 and not the other way round.

Answer 1

If I start with these four tables, named Table1 through Table4, respectively:

And they are related like this:

Then it looks like just using RELATED(Table[Table3-Entry]) works to get the values from Table3 while starting from Table1: