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Finding the Fourth Proportional to 81,791.10, 122,690.70 and 42,425.10

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Solution

The fourth proportional to 81,791.10, 122,690.70 and 42,425.10 is: 63,639.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,791.10 : 122,690.70 = 42,425.10 : x
  2. Step 2: Convert to fraction form
    81,791.10/122,690.70 = 42,425.10/x
  3. Step 3: Cross multiply
    81,791.10x = 122,690.70 × 42,425.10
  4. Step 4: Simplify right side
    81,791.10x = 5,205,165,216.57
  5. Step 5: Solve for x
    x = 5,205,165,216.57/81,791.10
  6. Step 6: Final answer
    x = 63,639.75

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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.