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Finding the Fourth Proportional to 418.12, 627.20 and 212.63

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Solution

The fourth proportional to 418.12, 627.20 and 212.63 is: 318.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.12 : 627.20 = 212.63 : x
  2. Step 2: Convert to fraction form
    418.12/627.20 = 212.63/x
  3. Step 3: Cross multiply
    418.12x = 627.20 × 212.63
  4. Step 4: Simplify right side
    418.12x = 133,361.54
  5. Step 5: Solve for x
    x = 133,361.54/418.12
  6. Step 6: Final answer
    x = 318.96

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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.