Sub a()
Dim plage As Range, premcel As Range, dercel As Range
Set plage = Range("A2:A7")
Set premcel = plage(1)
MsgBox "Première cellule = " & premcel.Address(0, 0) & vbLf & "Recherche de " & premcel
Application.ScreenUpdating = False
plage.Insert xlToRight 'insère une colonne auxiliaire
plage.Columns(0) = "=1/(""""&RC[1]=""" & premcel & """)"
plage.Columns(0).SpecialCells(xlCellTypeFormulas, 1).Select 'formules renvoyant un nombre
plage.Columns(0).Delete xlToLeft 'supprime la colonne auxiliaire
Application.ScreenUpdating = True
Set dercel = Selection.Find(premcel, , xlValues, xlWhole, , xlPrevious)
MsgBox "Dernière cellule = " & dercel.Address(0, 0)
End Sub