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Finding the Fourth Proportional to 128,450.69, 192,694.49 and 39,711.12

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Solution

The fourth proportional to 128,450.69, 192,694.49 and 39,711.12 is: 59,572.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,450.69 : 192,694.49 = 39,711.12 : x
  2. Step 2: Convert to fraction form
    128,450.69/192,694.49 = 39,711.12/x
  3. Step 3: Cross multiply
    128,450.69x = 192,694.49 × 39,711.12
  4. Step 4: Simplify right side
    128,450.69x = 7,652,114,015.73
  5. Step 5: Solve for x
    x = 7,652,114,015.73/128,450.69
  6. Step 6: Final answer
    x = 59,572.39

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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.