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Finding the Fourth Proportional to 81,687.80, 122,531.70 and 81,104.60

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Solution

The fourth proportional to 81,687.80, 122,531.70 and 81,104.60 is: 121,656.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,687.80 : 122,531.70 = 81,104.60 : x
  2. Step 2: Convert to fraction form
    81,687.80/122,531.70 = 81,104.60/x
  3. Step 3: Cross multiply
    81,687.80x = 122,531.70 × 81,104.60
  4. Step 4: Simplify right side
    81,687.80x = 9,937,884,515.82
  5. Step 5: Solve for x
    x = 9,937,884,515.82/81,687.80
  6. Step 6: Final answer
    x = 121,656.90

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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.