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Finding the Fourth Proportional to 31.52, 43.47 and 22.31

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Solution

The fourth proportional to 31.52, 43.47 and 22.31 is: 30.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.52 : 43.47 = 22.31 : x
  2. Step 2: Convert to fraction form
    31.52/43.47 = 22.31/x
  3. Step 3: Cross multiply
    31.52x = 43.47 × 22.31
  4. Step 4: Simplify right side
    31.52x = 969.60
  5. Step 5: Solve for x
    x = 969.60/31.52
  6. Step 6: Final answer
    x = 30.76

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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.