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Finding the Fourth Proportional to 641.78, 962.82 and 231.22

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Solution

The fourth proportional to 641.78, 962.82 and 231.22 is: 346.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.78 : 962.82 = 231.22 : x
  2. Step 2: Convert to fraction form
    641.78/962.82 = 231.22/x
  3. Step 3: Cross multiply
    641.78x = 962.82 × 231.22
  4. Step 4: Simplify right side
    641.78x = 222,623.24
  5. Step 5: Solve for x
    x = 222,623.24/641.78
  6. Step 6: Final answer
    x = 346.88

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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.