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Finding the Fourth Proportional to 138,916.90, 208,294.89 and 122,310.28

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Solution

The fourth proportional to 138,916.90, 208,294.89 and 122,310.28 is: 183,394.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,916.90 : 208,294.89 = 122,310.28 : x
  2. Step 2: Convert to fraction form
    138,916.90/208,294.89 = 122,310.28/x
  3. Step 3: Cross multiply
    138,916.90x = 208,294.89 × 122,310.28
  4. Step 4: Simplify right side
    138,916.90x = 25,476,606,318.47
  5. Step 5: Solve for x
    x = 25,476,606,318.47/138,916.90
  6. Step 6: Final answer
    x = 183,394.58

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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.