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Finding the Fourth Proportional to 128,545.70, 192,737.55 and 53,717.90

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Solution

The fourth proportional to 128,545.70, 192,737.55 and 53,717.90 is: 80,543.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,545.70 : 192,737.55 = 53,717.90 : x
  2. Step 2: Convert to fraction form
    128,545.70/192,737.55 = 53,717.90/x
  3. Step 3: Cross multiply
    128,545.70x = 192,737.55 × 53,717.90
  4. Step 4: Simplify right side
    128,545.70x = 10,353,456,437.15
  5. Step 5: Solve for x
    x = 10,353,456,437.15/128,545.70
  6. Step 6: Final answer
    x = 80,543.00

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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.