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Finding the Fourth Proportional to 8.79, 12.05 and 8.65

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Solution

The fourth proportional to 8.79, 12.05 and 8.65 is: 11.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.79 : 12.05 = 8.65 : x
  2. Step 2: Convert to fraction form
    8.79/12.05 = 8.65/x
  3. Step 3: Cross multiply
    8.79x = 12.05 × 8.65
  4. Step 4: Simplify right side
    8.79x = 104.24
  5. Step 5: Solve for x
    x = 104.24/8.79
  6. Step 6: Final answer
    x = 11.86

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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.