Can I trigger a workflow based on a related record field value?

Can I trigger a workflow based on a related record field value?

I have a string of triggered workflows to create a task on an opportunity.  Task 1 gets created when Opportunity stage is changed to a value "Get Meeting".  When Task 1 is completed, it triggers the creation of Task 2.  When Task 2 is completed, it triggers the creation of Task 3.

What I want to do is only trigger the creation of Task 2 (or 3) if the prior Task is closed AND the related Opportunity record state is still "Get Meeting".

Can I set my trigger criteria to check a related record value?