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Finding the Fourth Proportional to 221,490.20, 332,235.30 and 81,230.60

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Solution

The fourth proportional to 221,490.20, 332,235.30 and 81,230.60 is: 121,845.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,490.20 : 332,235.30 = 81,230.60 : x
  2. Step 2: Convert to fraction form
    221,490.20/332,235.30 = 81,230.60/x
  3. Step 3: Cross multiply
    221,490.20x = 332,235.30 × 81,230.60
  4. Step 4: Simplify right side
    221,490.20x = 26,987,672,760.18
  5. Step 5: Solve for x
    x = 26,987,672,760.18/221,490.20
  6. Step 6: Final answer
    x = 121,845.90

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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.