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Finding the Fourth Proportional to 9.05, 13.56 and 7.85

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Solution

The fourth proportional to 9.05, 13.56 and 7.85 is: 11.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.05 : 13.56 = 7.85 : x
  2. Step 2: Convert to fraction form
    9.05/13.56 = 7.85/x
  3. Step 3: Cross multiply
    9.05x = 13.56 × 7.85
  4. Step 4: Simplify right side
    9.05x = 106.45
  5. Step 5: Solve for x
    x = 106.45/9.05
  6. Step 6: Final answer
    x = 11.76

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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.