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Finding the Fourth Proportional to 72,931, 100,644.87 and 39,397

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Solution

The fourth proportional to 72,931, 100,644.87 and 39,397 is: 54,367.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,931 : 100,644.87 = 39,397 : x
  2. Step 2: Convert to fraction form
    72,931/100,644.87 = 39,397/x
  3. Step 3: Cross multiply
    72,931x = 100,644.87 × 39,397
  4. Step 4: Simplify right side
    72,931x = 3,965,105,943.39
  5. Step 5: Solve for x
    x = 3,965,105,943.39/72,931
  6. Step 6: Final answer
    x = 54,367.91

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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.