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Finding the Fourth Proportional to 31.72, 47.31 and 27.39

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Solution

The fourth proportional to 31.72, 47.31 and 27.39 is: 40.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.72 : 47.31 = 27.39 : x
  2. Step 2: Convert to fraction form
    31.72/47.31 = 27.39/x
  3. Step 3: Cross multiply
    31.72x = 47.31 × 27.39
  4. Step 4: Simplify right side
    31.72x = 1,295.82
  5. Step 5: Solve for x
    x = 1,295.82/31.72
  6. Step 6: Final answer
    x = 40.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.