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Finding the Fourth Proportional to 418.82, 628.25 and 141.20

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Solution

The fourth proportional to 418.82, 628.25 and 141.20 is: 211.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.82 : 628.25 = 141.20 : x
  2. Step 2: Convert to fraction form
    418.82/628.25 = 141.20/x
  3. Step 3: Cross multiply
    418.82x = 628.25 × 141.20
  4. Step 4: Simplify right side
    418.82x = 88,709.57
  5. Step 5: Solve for x
    x = 88,709.57/418.82
  6. Step 6: Final answer
    x = 211.81

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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.