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Finding the Fourth Proportional to 39,481, 54,483.78 and 21,817

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Solution

The fourth proportional to 39,481, 54,483.78 and 21,817 is: 30,107.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,481 : 54,483.78 = 21,817 : x
  2. Step 2: Convert to fraction form
    39,481/54,483.78 = 21,817/x
  3. Step 3: Cross multiply
    39,481x = 54,483.78 × 21,817
  4. Step 4: Simplify right side
    39,481x = 1,188,672,628.26
  5. Step 5: Solve for x
    x = 1,188,672,628.26/39,481
  6. Step 6: Final answer
    x = 30,107.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.