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Finding the Fourth Proportional to 234.89, 352.25 and 78.68

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Solution

The fourth proportional to 234.89, 352.25 and 78.68 is: 117.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    234.89 : 352.25 = 78.68 : x
  2. Step 2: Convert to fraction form
    234.89/352.25 = 78.68/x
  3. Step 3: Cross multiply
    234.89x = 352.25 × 78.68
  4. Step 4: Simplify right side
    234.89x = 27,715.03
  5. Step 5: Solve for x
    x = 27,715.03/234.89
  6. Step 6: Final answer
    x = 117.99

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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.