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Finding the Fourth Proportional to 641.78, 963.12 and 349.88

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Solution

The fourth proportional to 641.78, 963.12 and 349.88 is: 525.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.78 : 963.12 = 349.88 : x
  2. Step 2: Convert to fraction form
    641.78/963.12 = 349.88/x
  3. Step 3: Cross multiply
    641.78x = 963.12 × 349.88
  4. Step 4: Simplify right side
    641.78x = 336,971.61
  5. Step 5: Solve for x
    x = 336,971.61/641.78
  6. Step 6: Final answer
    x = 525.06

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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.