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Finding the Fourth Proportional to 18.87, 28.34 and 12.12

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Solution

The fourth proportional to 18.87, 28.34 and 12.12 is: 18.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.87 : 28.34 = 12.12 : x
  2. Step 2: Convert to fraction form
    18.87/28.34 = 12.12/x
  3. Step 3: Cross multiply
    18.87x = 28.34 × 12.12
  4. Step 4: Simplify right side
    18.87x = 343.42
  5. Step 5: Solve for x
    x = 343.42/18.87
  6. Step 6: Final answer
    x = 18.20

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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.