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Finding the Fourth Proportional to 517.78, 714.69 and 331.38

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Solution

The fourth proportional to 517.78, 714.69 and 331.38 is: 457.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.78 : 714.69 = 331.38 : x
  2. Step 2: Convert to fraction form
    517.78/714.69 = 331.38/x
  3. Step 3: Cross multiply
    517.78x = 714.69 × 331.38
  4. Step 4: Simplify right side
    517.78x = 236,833.97
  5. Step 5: Solve for x
    x = 236,833.97/517.78
  6. Step 6: Final answer
    x = 457.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.