Here is the JavaScript code to solve the problem: <script> // Get the grades from the prompt var grade1 = parseInt(prompt("Enter grade 1")); var grade2 = parseInt(prompt("Enter grade 2")); var grade3 = parseInt(prompt("Enter grade 3")); var grade4 = parseInt(prompt("Enter grade 4")); // Add all the grades var total = grade1 + grade2 + grade3 + grade4; // Calculate the final grade var finalGrade = total/4; // Display the final grade alert("The final grade is " + finalGrade); </script>