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Finding the Fourth Proportional to 85,912.90, 128,650.65 and 81,976.30

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Solution

The fourth proportional to 85,912.90, 128,650.65 and 81,976.30 is: 122,755.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,912.90 : 128,650.65 = 81,976.30 : x
  2. Step 2: Convert to fraction form
    85,912.90/128,650.65 = 81,976.30/x
  3. Step 3: Cross multiply
    85,912.90x = 128,650.65 × 81,976.30
  4. Step 4: Simplify right side
    85,912.90x = 10,546,304,279.60
  5. Step 5: Solve for x
    x = 10,546,304,279.60/85,912.90
  6. Step 6: Final answer
    x = 122,755.77

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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.