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Finding the Fourth Proportional to 71,439.78, 107,137.79 and 49,394.82

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Solution

The fourth proportional to 71,439.78, 107,137.79 and 49,394.82 is: 74,077.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,439.78 : 107,137.79 = 49,394.82 : x
  2. Step 2: Convert to fraction form
    71,439.78/107,137.79 = 49,394.82/x
  3. Step 3: Cross multiply
    71,439.78x = 107,137.79 × 49,394.82
  4. Step 4: Simplify right side
    71,439.78x = 5,292,051,069.58
  5. Step 5: Solve for x
    x = 5,292,051,069.58/71,439.78
  6. Step 6: Final answer
    x = 74,077.10

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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.