Is there a concept of correct proportions for thumbnails (pictures) in web design?

Question

User interface

For example, a catalog of goods, an online store.
Items have miniatures.
For some reason, I often see the sizes 222x152, 198x135, 308x200 so not even numbers.
When dividing the larger side by the smaller one, often 1.46666, 1.4555, 1.33333 are obtained.
Is there a concept of some proportion correct (something conditioned) or not?
That is, 300x205 is normally acceptable?

Answer 1

You need to add the tag "Opinion" or "IMHO" to my answer
There can be no aspect ratio for the thumbnail. The site is a canvas. Or a magazine catalog is a canvas. It has objects such as text, rulers, geometric shapes, photographs, etc. At the same time, I would single out miniatures in a separate category. Due to its small size, it cannot be recognized. For example, with a photo of a normal size, say 10 by 15, everything is different, on it we can highlight (inside the photo) some lines that can overlap with the same modular grid or font line. A miniature is perceived as a single colored spot. Accordingly, it is not the proportion of this miniature that is more important, but how it fits into the overall ensemble. That is, in summary: the size of the thumbnails should depend on the canvas, on its proportions and dimensions, on the modular grid, if it is present, and on the opinion of the designer. Sometimes the thumbnail will only have a width,
Well, this is if you do not consider at all the cases of assembling a mosaic from miniatures, where both sizes and proportions change if necessary.

Answer 2

Read about the golden ratio.

Answer 3

Proportions should be determined by the product.
If we sell cars, then we need a landscape orientation. For t-shirts, portrait orientation is more suitable.
According to the aspect ratio, you can choose the standard 4:3 (actually 1.33). This is the ratio of most cameras to old computer monitors. Then the thumbnails adjust to most of the photo.

Answer 4

I would do 1:1 with a frame.
So Instagram.
But it depends on the content and target audience, of course.