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Finding the Fourth Proportional to 418.38, 627.55 and 161.70

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Solution

The fourth proportional to 418.38, 627.55 and 161.70 is: 242.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.38 : 627.55 = 161.70 : x
  2. Step 2: Convert to fraction form
    418.38/627.55 = 161.70/x
  3. Step 3: Cross multiply
    418.38x = 627.55 × 161.70
  4. Step 4: Simplify right side
    418.38x = 101,474.84
  5. Step 5: Solve for x
    x = 101,474.84/418.38
  6. Step 6: Final answer
    x = 242.54

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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.