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Finding the Fourth Proportional to 52,400.40, 78,605.40 and 21,229.20

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Solution

The fourth proportional to 52,400.40, 78,605.40 and 21,229.20 is: 31,845.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    52,400.40 : 78,605.40 = 21,229.20 : x
  2. Step 2: Convert to fraction form
    52,400.40/78,605.40 = 21,229.20/x
  3. Step 3: Cross multiply
    52,400.40x = 78,605.40 × 21,229.20
  4. Step 4: Simplify right side
    52,400.40x = 1,668,729,757.68
  5. Step 5: Solve for x
    x = 1,668,729,757.68/52,400.40
  6. Step 6: Final answer
    x = 31,845.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.