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Finding the Fourth Proportional to 138,591.60, 191,256.56 and 74,929.40

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Solution

The fourth proportional to 138,591.60, 191,256.56 and 74,929.40 is: 103,402.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,591.60 : 191,256.56 = 74,929.40 : x
  2. Step 2: Convert to fraction form
    138,591.60/191,256.56 = 74,929.40/x
  3. Step 3: Cross multiply
    138,591.60x = 191,256.56 × 74,929.40
  4. Step 4: Simplify right side
    138,591.60x = 14,330,739,286.86
  5. Step 5: Solve for x
    x = 14,330,739,286.86/138,591.60
  6. Step 6: Final answer
    x = 103,402.65

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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.