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Finding the Fourth Proportional to 517.98, 714.80 and 285.10

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Solution

The fourth proportional to 517.98, 714.80 and 285.10 is: 393.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    517.98 : 714.80 = 285.10 : x
  2. Step 2: Convert to fraction form
    517.98/714.80 = 285.10/x
  3. Step 3: Cross multiply
    517.98x = 714.80 × 285.10
  4. Step 4: Simplify right side
    517.98x = 203,789.48
  5. Step 5: Solve for x
    x = 203,789.48/517.98
  6. Step 6: Final answer
    x = 393.43

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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.