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Finding the Fourth Proportional to 11.15, 16.70 and 8.60

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Solution

The fourth proportional to 11.15, 16.70 and 8.60 is: 12.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.15 : 16.70 = 8.60 : x
  2. Step 2: Convert to fraction form
    11.15/16.70 = 8.60/x
  3. Step 3: Cross multiply
    11.15x = 16.70 × 8.60
  4. Step 4: Simplify right side
    11.15x = 143.62
  5. Step 5: Solve for x
    x = 143.62/11.15
  6. Step 6: Final answer
    x = 12.88

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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.