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Finding the Fourth Proportional to 34.20, 47.12 and 28.06

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Solution

The fourth proportional to 34.20, 47.12 and 28.06 is: 38.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.20 : 47.12 = 28.06 : x
  2. Step 2: Convert to fraction form
    34.20/47.12 = 28.06/x
  3. Step 3: Cross multiply
    34.20x = 47.12 × 28.06
  4. Step 4: Simplify right side
    34.20x = 1,321.93
  5. Step 5: Solve for x
    x = 1,321.93/34.20
  6. Step 6: Final answer
    x = 38.65

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.