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Finding the Fourth Proportional to 138,201.89, 207,290.88 and 84,152.61

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Solution

The fourth proportional to 138,201.89, 207,290.88 and 84,152.61 is: 126,221.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,201.89 : 207,290.88 = 84,152.61 : x
  2. Step 2: Convert to fraction form
    138,201.89/207,290.88 = 84,152.61/x
  3. Step 3: Cross multiply
    138,201.89x = 207,290.88 × 84,152.61
  4. Step 4: Simplify right side
    138,201.89x = 17,444,068,581.20
  5. Step 5: Solve for x
    x = 17,444,068,581.20/138,201.89
  6. Step 6: Final answer
    x = 126,221.64

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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.