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Finding the Fourth Proportional to 85,922.97, 128,978.73 and 68,267.10

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Solution

The fourth proportional to 85,922.97, 128,978.73 and 68,267.10 is: 102,475.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,922.97 : 128,978.73 = 68,267.10 : x
  2. Step 2: Convert to fraction form
    85,922.97/128,978.73 = 68,267.10/x
  3. Step 3: Cross multiply
    85,922.97x = 128,978.73 × 68,267.10
  4. Step 4: Simplify right side
    85,922.97x = 8,805,003,858.78
  5. Step 5: Solve for x
    x = 8,805,003,858.78/85,922.97
  6. Step 6: Final answer
    x = 102,475.55

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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.