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Finding the Fourth Proportional to 576.92, 863.76 and 439.40

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Solution

The fourth proportional to 576.92, 863.76 and 439.40 is: 657.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.92 : 863.76 = 439.40 : x
  2. Step 2: Convert to fraction form
    576.92/863.76 = 439.40/x
  3. Step 3: Cross multiply
    576.92x = 863.76 × 439.40
  4. Step 4: Simplify right side
    576.92x = 379,536.14
  5. Step 5: Solve for x
    x = 379,536.14/576.92
  6. Step 6: Final answer
    x = 657.87

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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.