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Finding the Fourth Proportional to 138,666.52, 207,591.54 and 85,906.36

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Solution

The fourth proportional to 138,666.52, 207,591.54 and 85,906.36 is: 128,606.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,666.52 : 207,591.54 = 85,906.36 : x
  2. Step 2: Convert to fraction form
    138,666.52/207,591.54 = 85,906.36/x
  3. Step 3: Cross multiply
    138,666.52x = 207,591.54 × 85,906.36
  4. Step 4: Simplify right side
    138,666.52x = 17,833,433,568.19
  5. Step 5: Solve for x
    x = 17,833,433,568.19/138,666.52
  6. Step 6: Final answer
    x = 128,606.63

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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.