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Finding the Fourth Proportional to 221,688.48, 332,665.20 and 81,461.28

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Solution

The fourth proportional to 221,688.48, 332,665.20 and 81,461.28 is: 122,240.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,688.48 : 332,665.20 = 81,461.28 : x
  2. Step 2: Convert to fraction form
    221,688.48/332,665.20 = 81,461.28/x
  3. Step 3: Cross multiply
    221,688.48x = 332,665.20 × 81,461.28
  4. Step 4: Simplify right side
    221,688.48x = 27,099,333,003.46
  5. Step 5: Solve for x
    x = 27,099,333,003.46/221,688.48
  6. Step 6: Final answer
    x = 122,240.60

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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.