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Finding the Fourth Proportional to 445.29, 667.14 and 213.85

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Solution

The fourth proportional to 445.29, 667.14 and 213.85 is: 320.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.29 : 667.14 = 213.85 : x
  2. Step 2: Convert to fraction form
    445.29/667.14 = 213.85/x
  3. Step 3: Cross multiply
    445.29x = 667.14 × 213.85
  4. Step 4: Simplify right side
    445.29x = 142,667.89
  5. Step 5: Solve for x
    x = 142,667.89/445.29
  6. Step 6: Final answer
    x = 320.39

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.