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Finding the Fourth Proportional to 418.72, 627.67 and 213.38

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Solution

The fourth proportional to 418.72, 627.67 and 213.38 is: 319.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.72 : 627.67 = 213.38 : x
  2. Step 2: Convert to fraction form
    418.72/627.67 = 213.38/x
  3. Step 3: Cross multiply
    418.72x = 627.67 × 213.38
  4. Step 4: Simplify right side
    418.72x = 133,933.26
  5. Step 5: Solve for x
    x = 133,933.26/418.72
  6. Step 6: Final answer
    x = 319.87

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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.