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Finding the Fourth Proportional to 68.78, 103.14 and 34.49

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Solution

The fourth proportional to 68.78, 103.14 and 34.49 is: 51.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.78 : 103.14 = 34.49 : x
  2. Step 2: Convert to fraction form
    68.78/103.14 = 34.49/x
  3. Step 3: Cross multiply
    68.78x = 103.14 × 34.49
  4. Step 4: Simplify right side
    68.78x = 3,557.56
  5. Step 5: Solve for x
    x = 3,557.56/68.78
  6. Step 6: Final answer
    x = 51.72

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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.