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Finding the Fourth Proportional to 80,389.66, 120,582.66 and 21,229.48

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Solution

The fourth proportional to 80,389.66, 120,582.66 and 21,229.48 is: 31,843.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,389.66 : 120,582.66 = 21,229.48 : x
  2. Step 2: Convert to fraction form
    80,389.66/120,582.66 = 21,229.48/x
  3. Step 3: Cross multiply
    80,389.66x = 120,582.66 × 21,229.48
  4. Step 4: Simplify right side
    80,389.66x = 2,559,907,168.82
  5. Step 5: Solve for x
    x = 2,559,907,168.82/80,389.66
  6. Step 6: Final answer
    x = 31,843.74

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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.