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Finding the Fourth Proportional to 221,808.60, 332,712.90 and 81,621.90

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Solution

The fourth proportional to 221,808.60, 332,712.90 and 81,621.90 is: 122,432.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,808.60 : 332,712.90 = 81,621.90 : x
  2. Step 2: Convert to fraction form
    221,808.60/332,712.90 = 81,621.90/x
  3. Step 3: Cross multiply
    221,808.60x = 332,712.90 × 81,621.90
  4. Step 4: Simplify right side
    221,808.60x = 27,156,659,052.51
  5. Step 5: Solve for x
    x = 27,156,659,052.51/221,808.60
  6. Step 6: Final answer
    x = 122,432.85

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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.