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Finding the Fourth Proportional to 31.67, 43.70 and 18.73

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Solution

The fourth proportional to 31.67, 43.70 and 18.73 is: 25.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.67 : 43.70 = 18.73 : x
  2. Step 2: Convert to fraction form
    31.67/43.70 = 18.73/x
  3. Step 3: Cross multiply
    31.67x = 43.70 × 18.73
  4. Step 4: Simplify right side
    31.67x = 818.50
  5. Step 5: Solve for x
    x = 818.50/31.67
  6. Step 6: Final answer
    x = 25.84

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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.