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Finding the Fourth Proportional to 128,500.70, 192,760.80 and 39,763.18

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Solution

The fourth proportional to 128,500.70, 192,760.80 and 39,763.18 is: 59,647.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,500.70 : 192,760.80 = 39,763.18 : x
  2. Step 2: Convert to fraction form
    128,500.70/192,760.80 = 39,763.18/x
  3. Step 3: Cross multiply
    128,500.70x = 192,760.80 × 39,763.18
  4. Step 4: Simplify right side
    128,500.70x = 7,664,781,423.54
  5. Step 5: Solve for x
    x = 7,664,781,423.54/128,500.70
  6. Step 6: Final answer
    x = 59,647.78

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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.