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Finding the Fourth Proportional to 220,638.80, 331,044.60 and 80,411.60

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Solution

The fourth proportional to 220,638.80, 331,044.60 and 80,411.60 is: 120,648.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,638.80 : 331,044.60 = 80,411.60 : x
  2. Step 2: Convert to fraction form
    220,638.80/331,044.60 = 80,411.60/x
  3. Step 3: Cross multiply
    220,638.80x = 331,044.60 × 80,411.60
  4. Step 4: Simplify right side
    220,638.80x = 26,619,825,957.36
  5. Step 5: Solve for x
    x = 26,619,825,957.36/220,638.80
  6. Step 6: Final answer
    x = 120,648.89

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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.