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Finding the Fourth Proportional to 80,997.80, 121,496.70 and 61,314.80

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Solution

The fourth proportional to 80,997.80, 121,496.70 and 61,314.80 is: 91,972.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,997.80 : 121,496.70 = 61,314.80 : x
  2. Step 2: Convert to fraction form
    80,997.80/121,496.70 = 61,314.80/x
  3. Step 3: Cross multiply
    80,997.80x = 121,496.70 × 61,314.80
  4. Step 4: Simplify right side
    80,997.80x = 7,449,545,861.16
  5. Step 5: Solve for x
    x = 7,449,545,861.16/80,997.80
  6. Step 6: Final answer
    x = 91,972.20

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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.