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Finding the Fourth Proportional to 138,404.70, 207,261.45 and 91,403.10

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Solution

The fourth proportional to 138,404.70, 207,261.45 and 91,403.10 is: 136,876.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,404.70 : 207,261.45 = 91,403.10 : x
  2. Step 2: Convert to fraction form
    138,404.70/207,261.45 = 91,403.10/x
  3. Step 3: Cross multiply
    138,404.70x = 207,261.45 × 91,403.10
  4. Step 4: Simplify right side
    138,404.70x = 18,944,339,040.50
  5. Step 5: Solve for x
    x = 18,944,339,040.50/138,404.70
  6. Step 6: Final answer
    x = 136,876.41

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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.