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Finding the Fourth Proportional to 100,791.31, 139,092.03 and 55,469.28

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Solution

The fourth proportional to 100,791.31, 139,092.03 and 55,469.28 is: 76,547.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,791.31 : 139,092.03 = 55,469.28 : x
  2. Step 2: Convert to fraction form
    100,791.31/139,092.03 = 55,469.28/x
  3. Step 3: Cross multiply
    100,791.31x = 139,092.03 × 55,469.28
  4. Step 4: Simplify right side
    100,791.31x = 7,715,334,757.84
  5. Step 5: Solve for x
    x = 7,715,334,757.84/100,791.31
  6. Step 6: Final answer
    x = 76,547.62

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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.