JSFiddle - React, Tailwind, and code Playground

HTML

<select id="first_box">
  <option value="">-- Please select a value --</option>
  <option value="option1">options 1</option>
  <option value="option2">options 2</option>
  <option value="option3">options 3</option>
</select>

<select id="second_box">
  <option value="">-- Please select a value --</option>
  <option value="option1">options 1</option>
  <option value="option2">options 2</option>
  <option value="option3">options 3</option>
</select>

<select id="third_box">
  <option value="">-- Please select a value --</option>
  <option value="option1">options 1</option>
  <option value="option2">options 2</option>
  <option value="option3">options 3</option>
</select>

JavaScript

jQuery(function($){
    $('#first_box').change(function () {
        var first_box_value = $(this).val();
        $('#second_box').val(first_box_value);
        $('#third_box').val(first_box_value);
    });
});