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Finding the Fourth Proportional to 11.78, 17.68 and 11.20

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Solution

The fourth proportional to 11.78, 17.68 and 11.20 is: 16.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.78 : 17.68 = 11.20 : x
  2. Step 2: Convert to fraction form
    11.78/17.68 = 11.20/x
  3. Step 3: Cross multiply
    11.78x = 17.68 × 11.20
  4. Step 4: Simplify right side
    11.78x = 198.02
  5. Step 5: Solve for x
    x = 198.02/11.78
  6. Step 6: Final answer
    x = 16.81

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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.