<?php $array = [ [4, 3, 5, 7, 210], [4, 9, 5, 7, 210], [4, 9, 25, 7, 210], ]; var_export( array_map( fn($row) => $row + [array_key_last($row) => array_product($row) / array_pop($row)], $array ) );
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