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Finding the Fourth Proportional to 445.20, 667.54 and 213.91

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Solution

The fourth proportional to 445.20, 667.54 and 213.91 is: 320.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.20 : 667.54 = 213.91 : x
  2. Step 2: Convert to fraction form
    445.20/667.54 = 213.91/x
  3. Step 3: Cross multiply
    445.20x = 667.54 × 213.91
  4. Step 4: Simplify right side
    445.20x = 142,793.48
  5. Step 5: Solve for x
    x = 142,793.48/445.20
  6. Step 6: Final answer
    x = 320.74

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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.