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Finding the Fourth Proportional to 418.17, 627.28 and 212.47

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Solution

The fourth proportional to 418.17, 627.28 and 212.47 is: 318.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.17 : 627.28 = 212.47 : x
  2. Step 2: Convert to fraction form
    418.17/627.28 = 212.47/x
  3. Step 3: Cross multiply
    418.17x = 627.28 × 212.47
  4. Step 4: Simplify right side
    418.17x = 133,276.08
  5. Step 5: Solve for x
    x = 133,276.08/418.17
  6. Step 6: Final answer
    x = 318.71

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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.