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Finding the Fourth Proportional to 31.32, 43.42 and 29.75

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Solution

The fourth proportional to 31.32, 43.42 and 29.75 is: 41.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.32 : 43.42 = 29.75 : x
  2. Step 2: Convert to fraction form
    31.32/43.42 = 29.75/x
  3. Step 3: Cross multiply
    31.32x = 43.42 × 29.75
  4. Step 4: Simplify right side
    31.32x = 1,291.60
  5. Step 5: Solve for x
    x = 1,291.60/31.32
  6. Step 6: Final answer
    x = 41.24

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.