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Finding the Fourth Proportional to 418.39, 627.46 and 125.87

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Solution

The fourth proportional to 418.39, 627.46 and 125.87 is: 188.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.39 : 627.46 = 125.87 : x
  2. Step 2: Convert to fraction form
    418.39/627.46 = 125.87/x
  3. Step 3: Cross multiply
    418.39x = 627.46 × 125.87
  4. Step 4: Simplify right side
    418.39x = 78,974.94
  5. Step 5: Solve for x
    x = 78,974.94/418.39
  6. Step 6: Final answer
    x = 188.76

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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.