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Finding the Fourth Proportional to 11.89, 17.82 and 9.90

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Solution

The fourth proportional to 11.89, 17.82 and 9.90 is: 14.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.89 : 17.82 = 9.90 : x
  2. Step 2: Convert to fraction form
    11.89/17.82 = 9.90/x
  3. Step 3: Cross multiply
    11.89x = 17.82 × 9.90
  4. Step 4: Simplify right side
    11.89x = 176.42
  5. Step 5: Solve for x
    x = 176.42/11.89
  6. Step 6: Final answer
    x = 14.84

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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.