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Finding the Fourth Proportional to 517.91, 714.78 and 393.36

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Solution

The fourth proportional to 517.91, 714.78 and 393.36 is: 542.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.91 : 714.78 = 393.36 : x
  2. Step 2: Convert to fraction form
    517.91/714.78 = 393.36/x
  3. Step 3: Cross multiply
    517.91x = 714.78 × 393.36
  4. Step 4: Simplify right side
    517.91x = 281,165.86
  5. Step 5: Solve for x
    x = 281,165.86/517.91
  6. Step 6: Final answer
    x = 542.89

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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.