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Finding the Fourth Proportional to 139,546.80, 209,320.20 and 138,234.60

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Solution

The fourth proportional to 139,546.80, 209,320.20 and 138,234.60 is: 207,351.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,546.80 : 209,320.20 = 138,234.60 : x
  2. Step 2: Convert to fraction form
    139,546.80/209,320.20 = 138,234.60/x
  3. Step 3: Cross multiply
    139,546.80x = 209,320.20 × 138,234.60
  4. Step 4: Simplify right side
    139,546.80x = 28,935,294,118.92
  5. Step 5: Solve for x
    x = 28,935,294,118.92/139,546.80
  6. Step 6: Final answer
    x = 207,351.90

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1.5x scale

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.