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Finding the Fourth Proportional to 81,405.70, 122,108.55 and 66,631.30

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Solution

The fourth proportional to 81,405.70, 122,108.55 and 66,631.30 is: 99,946.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,405.70 : 122,108.55 = 66,631.30 : x
  2. Step 2: Convert to fraction form
    81,405.70/122,108.55 = 66,631.30/x
  3. Step 3: Cross multiply
    81,405.70x = 122,108.55 × 66,631.30
  4. Step 4: Simplify right side
    81,405.70x = 8,136,251,427.62
  5. Step 5: Solve for x
    x = 8,136,251,427.62/81,405.70
  6. Step 6: Final answer
    x = 99,946.95

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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.