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Finding the Fourth Proportional to 80,395.76, 120,599.40 and 21,230.84

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Solution

The fourth proportional to 80,395.76, 120,599.40 and 21,230.84 is: 31,847.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,395.76 : 120,599.40 = 21,230.84 : x
  2. Step 2: Convert to fraction form
    80,395.76/120,599.40 = 21,230.84/x
  3. Step 3: Cross multiply
    80,395.76x = 120,599.40 × 21,230.84
  4. Step 4: Simplify right side
    80,395.76x = 2,560,426,565.50
  5. Step 5: Solve for x
    x = 2,560,426,565.50/80,395.76
  6. Step 6: Final answer
    x = 31,847.78

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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.