A check drawn by a depositor in payment of a voucher for $725 was recorded in the journal as $257; what entry is required?

The orginal entry was:
Debit Cash for 257
Credit Assounts Receivable for 257

You need to do an entry so the correct amounts are $725 so you need to do another journal entry for the difference between $257 and $725 for the cash received and the account that was paid by a customer, which is Accounts Receivable account.

Payment is under recorded by 468 (725 - 275):
Debit Accounts payable or any appropriate account to which the payment relates - 468
Credit Bank 468