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Finding the Fourth Proportional to 138,867.66, 191,640.88 and 85,182.28

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Solution

The fourth proportional to 138,867.66, 191,640.88 and 85,182.28 is: 117,553.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,867.66 : 191,640.88 = 85,182.28 : x
  2. Step 2: Convert to fraction form
    138,867.66/191,640.88 = 85,182.28/x
  3. Step 3: Cross multiply
    138,867.66x = 191,640.88 × 85,182.28
  4. Step 4: Simplify right side
    138,867.66x = 16,324,407,099.61
  5. Step 5: Solve for x
    x = 16,324,407,099.61/138,867.66
  6. Step 6: Final answer
    x = 117,553.70

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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.