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Finding the Fourth Proportional to 518, 714.92 and 310.96

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Solution

The fourth proportional to 518, 714.92 and 310.96 is: 429.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    518 : 714.92 = 310.96 : x
  2. Step 2: Convert to fraction form
    518/714.92 = 310.96/x
  3. Step 3: Cross multiply
    518x = 714.92 × 310.96
  4. Step 4: Simplify right side
    518x = 222,311.52
  5. Step 5: Solve for x
    x = 222,311.52/518
  6. Step 6: Final answer
    x = 429.17

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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.