The simplest way:
Ratio a : b equals ratio c : d if (and only if) a*d = b*c
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1/2.
116 is an integer, not a fraction. It is equivalent to 116/1.
If the ratios are equivalent the corresponding points will all be on the same straight line through the origin.
The ratios a/b and c/d form a proportion is if their simplified forms are the same, or equivalently, if a*d = b*c
The simplified forms of the two ratios are the same.The cross products are the same: a/b = c/d if ad = bc