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Finding the Fourth Proportional to 11.85, 17.69 and 10.71

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Solution

The fourth proportional to 11.85, 17.69 and 10.71 is: 15.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.85 : 17.69 = 10.71 : x
  2. Step 2: Convert to fraction form
    11.85/17.69 = 10.71/x
  3. Step 3: Cross multiply
    11.85x = 17.69 × 10.71
  4. Step 4: Simplify right side
    11.85x = 189.46
  5. Step 5: Solve for x
    x = 189.46/11.85
  6. Step 6: Final answer
    x = 15.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.