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Finding the Fourth Proportional to 72,909.28, 100,614.78 and 39,375.28

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Solution

The fourth proportional to 72,909.28, 100,614.78 and 39,375.28 is: 54,337.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,909.28 : 100,614.78 = 39,375.28 : x
  2. Step 2: Convert to fraction form
    72,909.28/100,614.78 = 39,375.28/x
  3. Step 3: Cross multiply
    72,909.28x = 100,614.78 × 39,375.28
  4. Step 4: Simplify right side
    72,909.28x = 3,961,735,134.64
  5. Step 5: Solve for x
    x = 3,961,735,134.64/72,909.28
  6. Step 6: Final answer
    x = 54,337.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.