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Finding the Fourth Proportional to 81,273.20, 121,909.80 and 80,106.80

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Solution

The fourth proportional to 81,273.20, 121,909.80 and 80,106.80 is: 120,160.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,273.20 : 121,909.80 = 80,106.80 : x
  2. Step 2: Convert to fraction form
    81,273.20/121,909.80 = 80,106.80/x
  3. Step 3: Cross multiply
    81,273.20x = 121,909.80 × 80,106.80
  4. Step 4: Simplify right side
    81,273.20x = 9,765,803,966.64
  5. Step 5: Solve for x
    x = 9,765,803,966.64/81,273.20
  6. Step 6: Final answer
    x = 120,160.20

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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.