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Finding the Fourth Proportional to 576.96, 863.28 and 431.52

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Solution

The fourth proportional to 576.96, 863.28 and 431.52 is: 645.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    576.96 : 863.28 = 431.52 : x
  2. Step 2: Convert to fraction form
    576.96/863.28 = 431.52/x
  3. Step 3: Cross multiply
    576.96x = 863.28 × 431.52
  4. Step 4: Simplify right side
    576.96x = 372,522.59
  5. Step 5: Solve for x
    x = 372,522.59/576.96
  6. Step 6: Final answer
    x = 645.66

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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.