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Finding the Fourth Proportional to 138,587.60, 207,978.60 and 88,788.80

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Solution

The fourth proportional to 138,587.60, 207,978.60 and 88,788.80 is: 133,245.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,587.60 : 207,978.60 = 88,788.80 : x
  2. Step 2: Convert to fraction form
    138,587.60/207,978.60 = 88,788.80/x
  3. Step 3: Cross multiply
    138,587.60x = 207,978.60 × 88,788.80
  4. Step 4: Simplify right side
    138,587.60x = 18,466,170,319.68
  5. Step 5: Solve for x
    x = 18,466,170,319.68/138,587.60
  6. Step 6: Final answer
    x = 133,245.47

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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.