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Finding the Fourth Proportional to 128,591.12, 192,816.20 and 39,819.98

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Solution

The fourth proportional to 128,591.12, 192,816.20 and 39,819.98 is: 59,708.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,591.12 : 192,816.20 = 39,819.98 : x
  2. Step 2: Convert to fraction form
    128,591.12/192,816.20 = 39,819.98/x
  3. Step 3: Cross multiply
    128,591.12x = 192,816.20 × 39,819.98
  4. Step 4: Simplify right side
    128,591.12x = 7,677,936,363.14
  5. Step 5: Solve for x
    x = 7,677,936,363.14/128,591.12
  6. Step 6: Final answer
    x = 59,708.14

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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.