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Finding the Fourth Proportional to 27.11, 40.61 and 11.87

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Solution

The fourth proportional to 27.11, 40.61 and 11.87 is: 17.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    27.11 : 40.61 = 11.87 : x
  2. Step 2: Convert to fraction form
    27.11/40.61 = 11.87/x
  3. Step 3: Cross multiply
    27.11x = 40.61 × 11.87
  4. Step 4: Simplify right side
    27.11x = 482.15
  5. Step 5: Solve for x
    x = 482.15/27.11
  6. Step 6: Final answer
    x = 17.79

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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.