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Finding the Fourth Proportional to 31.82, 47.76 and 29.72

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Solution

The fourth proportional to 31.82, 47.76 and 29.72 is: 44.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.82 : 47.76 = 29.72 : x
  2. Step 2: Convert to fraction form
    31.82/47.76 = 29.72/x
  3. Step 3: Cross multiply
    31.82x = 47.76 × 29.72
  4. Step 4: Simplify right side
    31.82x = 1,419.43
  5. Step 5: Solve for x
    x = 1,419.43/31.82
  6. Step 6: Final answer
    x = 44.61

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.