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Finding the Fourth Proportional to 71,249.78, 98,356.20 and 42,579.56

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Solution

The fourth proportional to 71,249.78, 98,356.20 and 42,579.56 is: 58,778.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,249.78 : 98,356.20 = 42,579.56 : x
  2. Step 2: Convert to fraction form
    71,249.78/98,356.20 = 42,579.56/x
  3. Step 3: Cross multiply
    71,249.78x = 98,356.20 × 42,579.56
  4. Step 4: Simplify right side
    71,249.78x = 4,187,963,719.27
  5. Step 5: Solve for x
    x = 4,187,963,719.27/71,249.78
  6. Step 6: Final answer
    x = 58,778.62

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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.