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Finding the Fourth Proportional to 641.88, 963.72 and 411.12

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Solution

The fourth proportional to 641.88, 963.72 and 411.12 is: 617.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.88 : 963.72 = 411.12 : x
  2. Step 2: Convert to fraction form
    641.88/963.72 = 411.12/x
  3. Step 3: Cross multiply
    641.88x = 963.72 × 411.12
  4. Step 4: Simplify right side
    641.88x = 396,204.57
  5. Step 5: Solve for x
    x = 396,204.57/641.88
  6. Step 6: Final answer
    x = 617.26

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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.