Help with .next() method

Help with .next() method

Hi fellas!!!!
I'd like to ask you a question.
I'm needing to input dynamically some information inside of one specific div that have a class called: vagasAtividade.
if I make something like this, $(this).parent().next().next().next().load("inc/calculaVagasRestantes.php", {atv: $(this).val()}); it works perfectly but I think it's wrong do something like that.
I thought if I made like this: $(this).parent().next(".vagasAtividade").load("inc/calculaVagasRestantes.php", {atv: $(this).val()}); it will works fine, but don't. I don't found nothing that can help me until now.
Could someone please help me???