Feature request: Explain that by matching the numerator, the equivalent denominator will also match which is being determined

I noticed the option to report a mistake, but I doubt the following is considered one, thus am making a feature request. At the beginning of Worked example: Solving proportions (video) | Khan Academy, without explaining why, the host right away start matching the numerator and I remained puzzled how it would solve getting the matching denominator that's being determined. I had to stop the video and as it was the 1st mathematical study I did that day, it took me about a minute to figure out why.

I'd like that before there's an attempt at matching the numerators, it's explained how that will solve the equivalent denominator which is being determined.

PS: Also at the end of the same video it glances over how cross-multiplying does 2 steps and I also had to pause and take multiple seconds for me to understand.