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Finding the Fourth Proportional to 31.73, 47.47 and 28.31

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Solution

The fourth proportional to 31.73, 47.47 and 28.31 is: 42.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.73 : 47.47 = 28.31 : x
  2. Step 2: Convert to fraction form
    31.73/47.47 = 28.31/x
  3. Step 3: Cross multiply
    31.73x = 47.47 × 28.31
  4. Step 4: Simplify right side
    31.73x = 1,343.92
  5. Step 5: Solve for x
    x = 1,343.92/31.73
  6. Step 6: Final answer
    x = 42.35

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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.