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Finding the Fourth Proportional to 11.90, 17.81 and 10.85

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Solution

The fourth proportional to 11.90, 17.81 and 10.85 is: 16.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.90 : 17.81 = 10.85 : x
  2. Step 2: Convert to fraction form
    11.90/17.81 = 10.85/x
  3. Step 3: Cross multiply
    11.90x = 17.81 × 10.85
  4. Step 4: Simplify right side
    11.90x = 193.20
  5. Step 5: Solve for x
    x = 193.20/11.90
  6. Step 6: Final answer
    x = 16.23

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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.