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Finding the Fourth Proportional to 34.78, 47.66 and 34.12

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Solution

The fourth proportional to 34.78, 47.66 and 34.12 is: 46.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.78 : 47.66 = 34.12 : x
  2. Step 2: Convert to fraction form
    34.78/47.66 = 34.12/x
  3. Step 3: Cross multiply
    34.78x = 47.66 × 34.12
  4. Step 4: Simplify right side
    34.78x = 1,626.34
  5. Step 5: Solve for x
    x = 1,626.34/34.78
  6. Step 6: Final answer
    x = 46.76

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.