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Finding the Fourth Proportional to 418.92, 628.38 and 126.42

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Solution

The fourth proportional to 418.92, 628.38 and 126.42 is: 189.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.92 : 628.38 = 126.42 : x
  2. Step 2: Convert to fraction form
    418.92/628.38 = 126.42/x
  3. Step 3: Cross multiply
    418.92x = 628.38 × 126.42
  4. Step 4: Simplify right side
    418.92x = 79,442.22
  5. Step 5: Solve for x
    x = 79,442.22/418.92
  6. Step 6: Final answer
    x = 189.63

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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.