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Finding the Fourth Proportional to 80,491.80, 120,732.30 and 21,326.20

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Solution

The fourth proportional to 80,491.80, 120,732.30 and 21,326.20 is: 31,987.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,491.80 : 120,732.30 = 21,326.20 : x
  2. Step 2: Convert to fraction form
    80,491.80/120,732.30 = 21,326.20/x
  3. Step 3: Cross multiply
    80,491.80x = 120,732.30 × 21,326.20
  4. Step 4: Simplify right side
    80,491.80x = 2,574,761,176.26
  5. Step 5: Solve for x
    x = 2,574,761,176.26/80,491.80
  6. Step 6: Final answer
    x = 31,987.87

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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.