Minor chords make a lot more sense when you consider the 5th the actual root and basically view them as upside-down major chords.

Major, e.g. C: C, E (= C * 5/4), G (= C * 3/2) or 4:5:6
Minor, e.g. C⁻: C, Eᵇ (= C * 6/5), G (= C * 3/2) or 10:12:15
Minor, in relation to the 5th: G, Eᵇ (= G / 5/4), C (= G / 3/2) or 4/5/6

C⁻ should really be called G⁻.

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