1. The problem states: Given $iD = 30 = 1.24$ and $xRO = 4.95$, find what $50$ equals to. 2. It seems like $iD$ and $xRO$ are variables or values related by some unknown relationship, but the problem does not specify a formula or context. 3. Without a clear formula or relationship between $iD$, $xRO$, and the number $50$, we cannot directly calculate what $50$ equals to. 4. Please provide more information or the formula that relates these values so we can solve for the value corresponding to $50$.