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Finding the Fourth Proportional to 138,592.60, 191,257.94 and 74,930.40

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Solution

The fourth proportional to 138,592.60, 191,257.94 and 74,930.40 is: 103,404.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,592.60 : 191,257.94 = 74,930.40 : x
  2. Step 2: Convert to fraction form
    138,592.60/191,257.94 = 74,930.40/x
  3. Step 3: Cross multiply
    138,592.60x = 191,257.94 × 74,930.40
  4. Step 4: Simplify right side
    138,592.60x = 14,331,033,947.38
  5. Step 5: Solve for x
    x = 14,331,033,947.38/138,592.60
  6. Step 6: Final answer
    x = 103,404.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.