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Finding the Fourth Proportional to 641.78, 963.17 and 276.83

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Solution

The fourth proportional to 641.78, 963.17 and 276.83 is: 415.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.78 : 963.17 = 276.83 : x
  2. Step 2: Convert to fraction form
    641.78/963.17 = 276.83/x
  3. Step 3: Cross multiply
    641.78x = 963.17 × 276.83
  4. Step 4: Simplify right side
    641.78x = 266,634.35
  5. Step 5: Solve for x
    x = 266,634.35/641.78
  6. Step 6: Final answer
    x = 415.46

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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.