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Finding the Fourth Proportional to 418.20, 627.32 and 212.52

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Solution

The fourth proportional to 418.20, 627.32 and 212.52 is: 318.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.20 : 627.32 = 212.52 : x
  2. Step 2: Convert to fraction form
    418.20/627.32 = 212.52/x
  3. Step 3: Cross multiply
    418.20x = 627.32 × 212.52
  4. Step 4: Simplify right side
    418.20x = 133,318.05
  5. Step 5: Solve for x
    x = 133,318.05/418.20
  6. Step 6: Final answer
    x = 318.79

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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.