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Finding the Fourth Proportional to 81,491.80, 122,164.80 and 31,555.30

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Solution

The fourth proportional to 81,491.80, 122,164.80 and 31,555.30 is: 47,304.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,491.80 : 122,164.80 = 31,555.30 : x
  2. Step 2: Convert to fraction form
    81,491.80/122,164.80 = 31,555.30/x
  3. Step 3: Cross multiply
    81,491.80x = 122,164.80 × 31,555.30
  4. Step 4: Simplify right side
    81,491.80x = 3,854,946,913.44
  5. Step 5: Solve for x
    x = 3,854,946,913.44/81,491.80
  6. Step 6: Final answer
    x = 47,304.72

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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.