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Finding the Fourth Proportional to 34.31, 47.43 and 28.85

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Solution

The fourth proportional to 34.31, 47.43 and 28.85 is: 39.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    34.31 : 47.43 = 28.85 : x
  2. Step 2: Convert to fraction form
    34.31/47.43 = 28.85/x
  3. Step 3: Cross multiply
    34.31x = 47.43 × 28.85
  4. Step 4: Simplify right side
    34.31x = 1,368.36
  5. Step 5: Solve for x
    x = 1,368.36/34.31
  6. Step 6: Final answer
    x = 39.88

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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.