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Finding the Fourth Proportional to 71,279, 98,251.70 and 56,147.70

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Solution

The fourth proportional to 71,279, 98,251.70 and 56,147.70 is: 77,394.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,279 : 98,251.70 = 56,147.70 : x
  2. Step 2: Convert to fraction form
    71,279/98,251.70 = 56,147.70/x
  3. Step 3: Cross multiply
    71,279x = 98,251.70 × 56,147.70
  4. Step 4: Simplify right side
    71,279x = 5,516,606,976.09
  5. Step 5: Solve for x
    x = 5,516,606,976.09/71,279
  6. Step 6: Final answer
    x = 77,394.56

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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.