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Finding the Fourth Proportional to 418.78, 628.22 and 130.24

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Solution

The fourth proportional to 418.78, 628.22 and 130.24 is: 195.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.78 : 628.22 = 130.24 : x
  2. Step 2: Convert to fraction form
    418.78/628.22 = 130.24/x
  3. Step 3: Cross multiply
    418.78x = 628.22 × 130.24
  4. Step 4: Simplify right side
    418.78x = 81,819.37
  5. Step 5: Solve for x
    x = 81,819.37/418.78
  6. Step 6: Final answer
    x = 195.38

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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.