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Finding the Fourth Proportional to 138,709.31, 208,046.43 and 43,949.11

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Solution

The fourth proportional to 138,709.31, 208,046.43 and 43,949.11 is: 65,918.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,709.31 : 208,046.43 = 43,949.11 : x
  2. Step 2: Convert to fraction form
    138,709.31/208,046.43 = 43,949.11/x
  3. Step 3: Cross multiply
    138,709.31x = 208,046.43 × 43,949.11
  4. Step 4: Simplify right side
    138,709.31x = 9,143,456,067.17
  5. Step 5: Solve for x
    x = 9,143,456,067.17/138,709.31
  6. Step 6: Final answer
    x = 65,918.11

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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.