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Finding the Fourth Proportional to 221,355.20, 331,989.60 and 71,559.20

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Solution

The fourth proportional to 221,355.20, 331,989.60 and 71,559.20 is: 107,324.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,355.20 : 331,989.60 = 71,559.20 : x
  2. Step 2: Convert to fraction form
    221,355.20/331,989.60 = 71,559.20/x
  3. Step 3: Cross multiply
    221,355.20x = 331,989.60 × 71,559.20
  4. Step 4: Simplify right side
    221,355.20x = 23,756,910,184.32
  5. Step 5: Solve for x
    x = 23,756,910,184.32/221,355.20
  6. Step 6: Final answer
    x = 107,324.83

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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.