get_terms function will return an array of object. Each of them has term_id field which contains id of a term. Just use it instead of slug and you will have what you need:
<?php $terms = get_terms("ratios");
if ( $count($terms) > 0 ){
foreach ( $terms as $term ) {
echo "<option value="" . $term->term_id . "">" . $term->name . "</option>";
}
}?>
</select>
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