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Finding the Fourth Proportional to 80,388.76, 120,588.92 and 21,223.84

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Solution

The fourth proportional to 80,388.76, 120,588.92 and 21,223.84 is: 31,837.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,388.76 : 120,588.92 = 21,223.84 : x
  2. Step 2: Convert to fraction form
    80,388.76/120,588.92 = 21,223.84/x
  3. Step 3: Cross multiply
    80,388.76x = 120,588.92 × 21,223.84
  4. Step 4: Simplify right side
    80,388.76x = 2,559,359,943.85
  5. Step 5: Solve for x
    x = 2,559,359,943.85/80,388.76
  6. Step 6: Final answer
    x = 31,837.29

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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.