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Finding the Fourth Proportional to 19.11, 28.66 and 13.42

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Solution

The fourth proportional to 19.11, 28.66 and 13.42 is: 20.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    19.11 : 28.66 = 13.42 : x
  2. Step 2: Convert to fraction form
    19.11/28.66 = 13.42/x
  3. Step 3: Cross multiply
    19.11x = 28.66 × 13.42
  4. Step 4: Simplify right side
    19.11x = 384.62
  5. Step 5: Solve for x
    x = 384.62/19.11
  6. Step 6: Final answer
    x = 20.13

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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.