A type scale is a short list of permitted sizes with names and jobs. It exists so that two people laying out different pages arrive at the same typography without consulting each other.

Try it
Try the ratios against the brand's work. An app with six levels of heading wants a tight one, and a poster with three can take a wide one.
Ratio
Pick one ratio, multiply your base size by it repeatedly, and use only those sizes. The sizes are then related to each other instead of chosen one at a time, which is the entire benefit, and it is a real one, because most muddled-looking pages are muddled in their size steps rather than in their fonts.
The ratios are borrowed from musical intervals, and the golden ratio is on the list because it always is. None of them is correct. A tight ratio like 1.125 suits an interface with many levels; a wide one like 1.5 suits a poster with three. Choosing a wide ratio and then needing six levels is how people end up back where they started.
48.8pxHandgloves
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16.0pxHandgloves
12.8pxHandgloves
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