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Finding the Fourth Proportional to 128,468.70, 192,703.05 and 84,231.90

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Solution

The fourth proportional to 128,468.70, 192,703.05 and 84,231.90 is: 126,347.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,468.70 : 192,703.05 = 84,231.90 : x
  2. Step 2: Convert to fraction form
    128,468.70/192,703.05 = 84,231.90/x
  3. Step 3: Cross multiply
    128,468.70x = 192,703.05 × 84,231.90
  4. Step 4: Simplify right side
    128,468.70x = 16,231,744,037.30
  5. Step 5: Solve for x
    x = 16,231,744,037.30/128,468.70
  6. Step 6: Final answer
    x = 126,347.85

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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.