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Finding the Fourth Proportional to 138,135.27, 207,592.92 and 81,985.87

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Solution

The fourth proportional to 138,135.27, 207,592.92 and 81,985.87 is: 123,210.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,135.27 : 207,592.92 = 81,985.87 : x
  2. Step 2: Convert to fraction form
    138,135.27/207,592.92 = 81,985.87/x
  3. Step 3: Cross multiply
    138,135.27x = 207,592.92 × 81,985.87
  4. Step 4: Simplify right side
    138,135.27x = 17,019,686,152.04
  5. Step 5: Solve for x
    x = 17,019,686,152.04/138,135.27
  6. Step 6: Final answer
    x = 123,210.29

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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.