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Finding the Fourth Proportional to 81,405.40, 122,108.10 and 72,496.60

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Solution

The fourth proportional to 81,405.40, 122,108.10 and 72,496.60 is: 108,744.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,405.40 : 122,108.10 = 72,496.60 : x
  2. Step 2: Convert to fraction form
    81,405.40/122,108.10 = 72,496.60/x
  3. Step 3: Cross multiply
    81,405.40x = 122,108.10 × 72,496.60
  4. Step 4: Simplify right side
    81,405.40x = 8,852,422,082.46
  5. Step 5: Solve for x
    x = 8,852,422,082.46/81,405.40
  6. Step 6: Final answer
    x = 108,744.90

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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.