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Finding the Fourth Proportional to 80,390.76, 120,591.92 and 21,225.84

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Solution

The fourth proportional to 80,390.76, 120,591.92 and 21,225.84 is: 31,840.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,390.76 : 120,591.92 = 21,225.84 : x
  2. Step 2: Convert to fraction form
    80,390.76/120,591.92 = 21,225.84/x
  3. Step 3: Cross multiply
    80,390.76x = 120,591.92 × 21,225.84
  4. Step 4: Simplify right side
    80,390.76x = 2,559,664,799.21
  5. Step 5: Solve for x
    x = 2,559,664,799.21/80,390.76
  6. Step 6: Final answer
    x = 31,840.29

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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.