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Finding the Fourth Proportional to 31.71, 43.72 and 21.37

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Solution

The fourth proportional to 31.71, 43.72 and 21.37 is: 29.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.71 : 43.72 = 21.37 : x
  2. Step 2: Convert to fraction form
    31.71/43.72 = 21.37/x
  3. Step 3: Cross multiply
    31.71x = 43.72 × 21.37
  4. Step 4: Simplify right side
    31.71x = 934.30
  5. Step 5: Solve for x
    x = 934.30/31.71
  6. Step 6: Final answer
    x = 29.46

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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.