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Finding the Fourth Proportional to 234.78, 351.78 and 80.62

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Solution

The fourth proportional to 234.78, 351.78 and 80.62 is: 120.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    234.78 : 351.78 = 80.62 : x
  2. Step 2: Convert to fraction form
    234.78/351.78 = 80.62/x
  3. Step 3: Cross multiply
    234.78x = 351.78 × 80.62
  4. Step 4: Simplify right side
    234.78x = 28,359.62
  5. Step 5: Solve for x
    x = 28,359.62/234.78
  6. Step 6: Final answer
    x = 120.79

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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.