<script>
jQuery(document).ready(function ($) {
	// Hide field by default
	var hideme = $("#frm_radio_1831-1786-0");
	hideme.css('display', 'none');
	$('input[name="item_meta[1788]"]').change(function () {
		var val1 = $(this).val();
		if (val1 == 'Option 1') {
			hideme.show();
		} else {
			hideme.hide();
		}
	});
});
</script>

• Change #frm_radio_1831-1786-0 to the ID of the radio button option you want to show/hide.
• Change 1788 to the ID of the radio button field you want to watch.
• Change 'Option 1' to the value that will need to be chosen.