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Finding the Fourth Proportional to 221,906.40, 332,908.20 and 72,121.20

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Solution

The fourth proportional to 221,906.40, 332,908.20 and 72,121.20 is: 108,197.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,906.40 : 332,908.20 = 72,121.20 : x
  2. Step 2: Convert to fraction form
    221,906.40/332,908.20 = 72,121.20/x
  3. Step 3: Cross multiply
    221,906.40x = 332,908.20 × 72,121.20
  4. Step 4: Simplify right side
    221,906.40x = 24,009,738,873.84
  5. Step 5: Solve for x
    x = 24,009,738,873.84/221,906.40
  6. Step 6: Final answer
    x = 108,197.60

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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.