How to list blog post from subdirectory wordpress install to the main site

I have decided to separate my main website and my blog with different Wordpress installs. I've installed my blog in the subdirectory (/blog/ folder) and my main Wordpress is only contained homepage and pages related to my business.

The problem is, is it possible to create a section on my main website that lists 4 latest posts from my blog that are installed in the subdirectory? I have searched all over the internet for the solution, but I've found nothing.

Can you tell me how can I solve this?