displaying last 3 post on home page in a 3 colume layout

im trying to get my last 3 post to display on my homepage as a 3 colum layout. The layout is divs and css and works fine but on the last colum it needs a class of “last”

i cant for the love of me get the last one to display as last, here is where i got to.

<?php for ($i = 1; $i <= 3; $i++) { ?>
<?php
$args = array( 'numberposts' => 3 );
$lastposts = get_posts( $args );
foreach($lastposts as $post) : setup_postdata($post); ?>
<div class="boxes one_third <?php if ($i == 3) {echo "last";} ?>">
<h3><a href="<?php the_permalink(); ?>"><?php the_title(); ?></a></h3>
<?php the_content(); ?>
</div>
<?php endforeach; ?>
<?php } ?>

but this displays 3 post 3 time, so shows 9 post in all repeating