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Finding the Fourth Proportional to 128,737.20, 193,163.40 and 58,580.40

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Solution

The fourth proportional to 128,737.20, 193,163.40 and 58,580.40 is: 87,896.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,737.20 : 193,163.40 = 58,580.40 : x
  2. Step 2: Convert to fraction form
    128,737.20/193,163.40 = 58,580.40/x
  3. Step 3: Cross multiply
    128,737.20x = 193,163.40 × 58,580.40
  4. Step 4: Simplify right side
    128,737.20x = 11,315,589,237.36
  5. Step 5: Solve for x
    x = 11,315,589,237.36/128,737.20
  6. Step 6: Final answer
    x = 87,896.81

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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.