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Finding the Fourth Proportional to 349.64, 520.82 and 331

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Solution

The fourth proportional to 349.64, 520.82 and 331 is: 493.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    349.64 : 520.82 = 331 : x
  2. Step 2: Convert to fraction form
    349.64/520.82 = 331/x
  3. Step 3: Cross multiply
    349.64x = 520.82 × 331
  4. Step 4: Simplify right side
    349.64x = 172,391.42
  5. Step 5: Solve for x
    x = 172,391.42/349.64
  6. Step 6: Final answer
    x = 493.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.