It seems like there's a misunderstanding in the inequality provided. The inequality \(648 < 48\) is not true since \(648\) is greater than \(48\).
If you meant to express a situation where we can replace a digit within these numbers to investigate the inequality, you'll need to clarify what digits you are allowed to change. For instance, if you're thinking of changing a digit in either "648" or "48" to see if we can make an inequality true, please provide more specifics.
Let me know how you'd like to proceed!