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Finding the Fourth Proportional to 128,580.05, 192,900.87 and 53,658.52

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Solution

The fourth proportional to 128,580.05, 192,900.87 and 53,658.52 is: 80,500.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,580.05 : 192,900.87 = 53,658.52 : x
  2. Step 2: Convert to fraction form
    128,580.05/192,900.87 = 53,658.52/x
  3. Step 3: Cross multiply
    128,580.05x = 192,900.87 × 53,658.52
  4. Step 4: Simplify right side
    128,580.05x = 10,350,775,190.91
  5. Step 5: Solve for x
    x = 10,350,775,190.91/128,580.05
  6. Step 6: Final answer
    x = 80,500.63

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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.