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Finding the Fourth Proportional to 221,132.40, 331,698.60 and 80,905.20

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Solution

The fourth proportional to 221,132.40, 331,698.60 and 80,905.20 is: 121,357.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    221,132.40 : 331,698.60 = 80,905.20 : x
  2. Step 2: Convert to fraction form
    221,132.40/331,698.60 = 80,905.20/x
  3. Step 3: Cross multiply
    221,132.40x = 331,698.60 × 80,905.20
  4. Step 4: Simplify right side
    221,132.40x = 26,836,141,572.72
  5. Step 5: Solve for x
    x = 26,836,141,572.72/221,132.40
  6. Step 6: Final answer
    x = 121,357.80

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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.