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Finding the Fourth Proportional to 9.05, 12.40 and 8.86

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Solution

The fourth proportional to 9.05, 12.40 and 8.86 is: 12.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.05 : 12.40 = 8.86 : x
  2. Step 2: Convert to fraction form
    9.05/12.40 = 8.86/x
  3. Step 3: Cross multiply
    9.05x = 12.40 × 8.86
  4. Step 4: Simplify right side
    9.05x = 109.86
  5. Step 5: Solve for x
    x = 109.86/9.05
  6. Step 6: Final answer
    x = 12.14

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.