Change responsive size image ratio, how to do?

I want to change my manufacturer image size to a responsive one so that it moves with it. I found out that it is not displayed properly on my site.

    $schema_json['brand']['name'] = $product->manufacturer->name;

  list($width, $height) = functions::image_scale_by_width(240, settings::get('manufacturer_image_ratio'));
    $_page->snippets['manufacturer'] = [
      'id' => $product->manufacturer->id,
      'name' => $product->manufacturer->name,
      'image' => [],
      'link' => document::ilink('manufacturer', ['manufacturer_id' => $product->manufacturer->id]),
    ];

    if (!empty($product->manufacturer->image)) {
      $_page->snippets['manufacturer']['image'] = [
        'original' => 'images/' . $product->manufacturer->image,
        'thumbnail' => functions::image_thumbnail(FS_DIR_STORAGE . 'images/' . $product->manufacturer->image, $width, $height),
        'thumbnail_2x' => functions::image_thumbnail(FS_DIR_STORAGE . 'images/' . $product->manufacturer->image, $width*2, $height*2),
        'ratio' => str_replace(':', '/', settings::get('manufacturer_image_ratio')),
        'viewport' => [
          'width' => $width,
          'height' => $height,
        ],
      ];
    }
  }```

This is the code I entered in pages/product, I know that a manufacturers_image_ratio cannot be requested because this is not entered in settings. Can someone help me how to manually set this myself in the code?

For now I use this line in views/box_product. The problem is only that the size of the image still gets larger than the set 240px, so that's why I started trying something else.

<img src="<?php echo document::href_rlink(FS_DIR_STORAGE . $manufacturer['image']['thumbnail']); ?>" srcset="<?php echo document::href_rlink(FS_DIR_STORAGE . $manufacturer['image']['thumbnail']); ?> 1x, <?php echo document::href_rlink(FS_DIR_STORAGE . $manufacturer['image']['thumbnail_2x']); ?> 2x" alt="<?php echo functions::escape_html($manufacturer['name']); ?>" width="100%" max width="240px" height="auto" title="<?php echo functions::escape_html($manufacturer['name']); ?>" />

For responsive images assign class="img-responsive" to the <img> element.

There is no ratio setting named manufacturer_image_ratio. There is for products and categories only. Either add it to lc_settings or simply define your ratio n the code like this:
list($width, $height) = functions::image_scale_by_width(240, '4:1');

You can also set the $width and $height directly like this:

$height = 60;```

Thank you! with img-responsive it works for me.