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Finding the Fourth Proportional to 331.11, 499.66 and 320.85

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Solution

The fourth proportional to 331.11, 499.66 and 320.85 is: 484.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.11 : 499.66 = 320.85 : x
  2. Step 2: Convert to fraction form
    331.11/499.66 = 320.85/x
  3. Step 3: Cross multiply
    331.11x = 499.66 × 320.85
  4. Step 4: Simplify right side
    331.11x = 160,315.11
  5. Step 5: Solve for x
    x = 160,315.11/331.11
  6. Step 6: Final answer
    x = 484.17

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.