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Finding the Fourth Proportional to 138,606.20, 207,617.70 and 115,278.20

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Solution

The fourth proportional to 138,606.20, 207,617.70 and 115,278.20 is: 172,674.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,606.20 : 207,617.70 = 115,278.20 : x
  2. Step 2: Convert to fraction form
    138,606.20/207,617.70 = 115,278.20/x
  3. Step 3: Cross multiply
    138,606.20x = 207,617.70 × 115,278.20
  4. Step 4: Simplify right side
    138,606.20x = 23,933,794,744.14
  5. Step 5: Solve for x
    x = 23,933,794,744.14/138,606.20
  6. Step 6: Final answer
    x = 172,674.78

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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.