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Finding the Fourth Proportional to 13.66, 20.47 and 11.77

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Solution

The fourth proportional to 13.66, 20.47 and 11.77 is: 17.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.66 : 20.47 = 11.77 : x
  2. Step 2: Convert to fraction form
    13.66/20.47 = 11.77/x
  3. Step 3: Cross multiply
    13.66x = 20.47 × 11.77
  4. Step 4: Simplify right side
    13.66x = 240.93
  5. Step 5: Solve for x
    x = 240.93/13.66
  6. Step 6: Final answer
    x = 17.64

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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.