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Finding the Fourth Proportional to 11.43, 17.16 and 7.89

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Solution

The fourth proportional to 11.43, 17.16 and 7.89 is: 11.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.43 : 17.16 = 7.89 : x
  2. Step 2: Convert to fraction form
    11.43/17.16 = 7.89/x
  3. Step 3: Cross multiply
    11.43x = 17.16 × 7.89
  4. Step 4: Simplify right side
    11.43x = 135.39
  5. Step 5: Solve for x
    x = 135.39/11.43
  6. Step 6: Final answer
    x = 11.85

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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.