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Finding the Fourth Proportional to 445.31, 667.79 and 214.14

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Solution

The fourth proportional to 445.31, 667.79 and 214.14 is: 321.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.31 : 667.79 = 214.14 : x
  2. Step 2: Convert to fraction form
    445.31/667.79 = 214.14/x
  3. Step 3: Cross multiply
    445.31x = 667.79 × 214.14
  4. Step 4: Simplify right side
    445.31x = 143,000.28
  5. Step 5: Solve for x
    x = 143,000.28/445.31
  6. Step 6: Final answer
    x = 321.13

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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.