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Finding the Fourth Proportional to 128,633.87, 192,909.90 and 120,237.92

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Solution

The fourth proportional to 128,633.87, 192,909.90 and 120,237.92 is: 180,318.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,633.87 : 192,909.90 = 120,237.92 : x
  2. Step 2: Convert to fraction form
    128,633.87/192,909.90 = 120,237.92/x
  3. Step 3: Cross multiply
    128,633.87x = 192,909.90 × 120,237.92
  4. Step 4: Simplify right side
    128,633.87x = 23,195,085,333.16
  5. Step 5: Solve for x
    x = 23,195,085,333.16/128,633.87
  6. Step 6: Final answer
    x = 180,318.64

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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.