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Finding the Fourth Proportional to 139,469.20, 209,203.80 and 86,203.60

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Solution

The fourth proportional to 139,469.20, 209,203.80 and 86,203.60 is: 129,305.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,469.20 : 209,203.80 = 86,203.60 : x
  2. Step 2: Convert to fraction form
    139,469.20/209,203.80 = 86,203.60/x
  3. Step 3: Cross multiply
    139,469.20x = 209,203.80 × 86,203.60
  4. Step 4: Simplify right side
    139,469.20x = 18,034,120,693.68
  5. Step 5: Solve for x
    x = 18,034,120,693.68/139,469.20
  6. Step 6: Final answer
    x = 129,305.40

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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.