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When the cross-products of the two ratios are equal.
cross multiply
No but the equal ratios are called Equivalent Ratios.
Cross-multiply them in pairs. The ratios are the same if and only if the answers are the same. Thus a/b = c/d iff a*d = b*c.
An equal ratio would be 2:154, for further ratios just multiply both parts by two because the ratio continues to function.