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Finding the Fourth Proportional to 128,626.79, 192,960.63 and 39,861.92

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Solution

The fourth proportional to 128,626.79, 192,960.63 and 39,861.92 is: 59,799.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,626.79 : 192,960.63 = 39,861.92 : x
  2. Step 2: Convert to fraction form
    128,626.79/192,960.63 = 39,861.92/x
  3. Step 3: Cross multiply
    128,626.79x = 192,960.63 × 39,861.92
  4. Step 4: Simplify right side
    128,626.79x = 7,691,781,678.61
  5. Step 5: Solve for x
    x = 7,691,781,678.61/128,626.79
  6. Step 6: Final answer
    x = 59,799.22

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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.