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Finding the Fourth Proportional to 18.03, 24.89 and 12.85

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Solution

The fourth proportional to 18.03, 24.89 and 12.85 is: 17.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.03 : 24.89 = 12.85 : x
  2. Step 2: Convert to fraction form
    18.03/24.89 = 12.85/x
  3. Step 3: Cross multiply
    18.03x = 24.89 × 12.85
  4. Step 4: Simplify right side
    18.03x = 319.84
  5. Step 5: Solve for x
    x = 319.84/18.03
  6. Step 6: Final answer
    x = 17.74

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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.