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Finding the Fourth Proportional to 331.29, 456.84 and 311.70

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Solution

The fourth proportional to 331.29, 456.84 and 311.70 is: 429.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.29 : 456.84 = 311.70 : x
  2. Step 2: Convert to fraction form
    331.29/456.84 = 311.70/x
  3. Step 3: Cross multiply
    331.29x = 456.84 × 311.70
  4. Step 4: Simplify right side
    331.29x = 142,396.17
  5. Step 5: Solve for x
    x = 142,396.17/331.29
  6. Step 6: Final answer
    x = 429.82

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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.