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Finding the Fourth Proportional to 31.32, 43.21 and 20.96

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Solution

The fourth proportional to 31.32, 43.21 and 20.96 is: 28.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.32 : 43.21 = 20.96 : x
  2. Step 2: Convert to fraction form
    31.32/43.21 = 20.96/x
  3. Step 3: Cross multiply
    31.32x = 43.21 × 20.96
  4. Step 4: Simplify right side
    31.32x = 905.68
  5. Step 5: Solve for x
    x = 905.68/31.32
  6. Step 6: Final answer
    x = 28.92

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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.