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Finding the Fourth Proportional to 138,913, 208,481.22 and 72,373

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Solution

The fourth proportional to 138,913, 208,481.22 and 72,373 is: 108,617.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,913 : 208,481.22 = 72,373 : x
  2. Step 2: Convert to fraction form
    138,913/208,481.22 = 72,373/x
  3. Step 3: Cross multiply
    138,913x = 208,481.22 × 72,373
  4. Step 4: Simplify right side
    138,913x = 15,088,411,335.06
  5. Step 5: Solve for x
    x = 15,088,411,335.06/138,913
  6. Step 6: Final answer
    x = 108,617.71

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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.