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Finding the Fourth Proportional to 718,814.28, 991,960.92 and 396,544.44

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Solution

The fourth proportional to 718,814.28, 991,960.92 and 396,544.44 is: 547,229.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,814.28 : 991,960.92 = 396,544.44 : x
  2. Step 2: Convert to fraction form
    718,814.28/991,960.92 = 396,544.44/x
  3. Step 3: Cross multiply
    718,814.28x = 991,960.92 × 396,544.44
  4. Step 4: Simplify right side
    718,814.28x = 393,356,587,523.29
  5. Step 5: Solve for x
    x = 393,356,587,523.29/718,814.28
  6. Step 6: Final answer
    x = 547,229.79

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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.