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Finding the Fourth Proportional to 31.71, 43.80 and 28.28

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Solution

The fourth proportional to 31.71, 43.80 and 28.28 is: 39.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.71 : 43.80 = 28.28 : x
  2. Step 2: Convert to fraction form
    31.71/43.80 = 28.28/x
  3. Step 3: Cross multiply
    31.71x = 43.80 × 28.28
  4. Step 4: Simplify right side
    31.71x = 1,238.66
  5. Step 5: Solve for x
    x = 1,238.66/31.71
  6. Step 6: Final answer
    x = 39.06

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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.