Get related portfolio posts by tags in portfolio pages

I am using this code to get related posts.

<?php if ( is_single() ) { 

	$tags = wp_get_post_terms(get_the_ID());
	if ($tags) { 

		$tagcount = count($tags);
		for ($i = 0; $i < $tagcount; $i++) {
			$tagIDs[$i] = $tags[$i]->term_id;
		}

		$args = array(
			'tag__in' => $tagIDs,
			'post__not_in' => array ($post->ID),
			'posts_per_page' => 5,
			'ignore_sticky_post' => 1
		);

		$relacionadas = new WP_Query ($args);
		if ($relacionadas->have_posts()) : ?>
			<div class="wrapper-related-posts">
				<p><span class="prefix-widget-title"><i class="fa fa-chevron-right"></i></span> <?php _e('Related posts', 'ribosome'); ?></p>
				<div class="related-post">
				<?php
					while ($relacionadas->have_posts()) :
						$relacionadas->the_post(); ?>						

							'><?php the_title(); ?>

				   <?php endwhile; ?>

				 </div><!-- .recent-post -->
			</div><!-- .wrapper-related-posts -->

			<?php wp_reset_postdata(); ?>

		<?php endif; // if ($relacionadas->have_posts())
		?>
	<?php } //if ($tags)
} //if ( is_single()
?>

But this code not showing related portfolio (jetpack-portfolio) posts in portfolio pages. How to get that?