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Finding the Fourth Proportional to 67,939.70, 101,913.10 and 20,553.60

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Solution

The fourth proportional to 67,939.70, 101,913.10 and 20,553.60 is: 30,831.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,939.70 : 101,913.10 = 20,553.60 : x
  2. Step 2: Convert to fraction form
    67,939.70/101,913.10 = 20,553.60/x
  3. Step 3: Cross multiply
    67,939.70x = 101,913.10 × 20,553.60
  4. Step 4: Simplify right side
    67,939.70x = 2,094,681,092.16
  5. Step 5: Solve for x
    x = 2,094,681,092.16/67,939.70
  6. Step 6: Final answer
    x = 30,831.47

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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.