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Finding the Fourth Proportional to 91,247, 125,920.92 and 51,503

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Solution

The fourth proportional to 91,247, 125,920.92 and 51,503 is: 71,074.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,247 : 125,920.92 = 51,503 : x
  2. Step 2: Convert to fraction form
    91,247/125,920.92 = 51,503/x
  3. Step 3: Cross multiply
    91,247x = 125,920.92 × 51,503
  4. Step 4: Simplify right side
    91,247x = 6,485,305,142.76
  5. Step 5: Solve for x
    x = 6,485,305,142.76/91,247
  6. Step 6: Final answer
    x = 71,074.17

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.