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Finding the Fourth Proportional to 12.86, 17.69 and 10.81

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Solution

The fourth proportional to 12.86, 17.69 and 10.81 is: 14.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.86 : 17.69 = 10.81 : x
  2. Step 2: Convert to fraction form
    12.86/17.69 = 10.81/x
  3. Step 3: Cross multiply
    12.86x = 17.69 × 10.81
  4. Step 4: Simplify right side
    12.86x = 191.24
  5. Step 5: Solve for x
    x = 191.24/12.86
  6. Step 6: Final answer
    x = 14.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.