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Finding the Fourth Proportional to 31.82, 43.34 and 31.72

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Solution

The fourth proportional to 31.82, 43.34 and 31.72 is: 43.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.82 : 43.34 = 31.72 : x
  2. Step 2: Convert to fraction form
    31.82/43.34 = 31.72/x
  3. Step 3: Cross multiply
    31.82x = 43.34 × 31.72
  4. Step 4: Simplify right side
    31.82x = 1,374.74
  5. Step 5: Solve for x
    x = 1,374.74/31.82
  6. Step 6: Final answer
    x = 43.20

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.