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Finding the Fourth Proportional to 13.31, 19.88 and 11.86

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Solution

The fourth proportional to 13.31, 19.88 and 11.86 is: 17.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.31 : 19.88 = 11.86 : x
  2. Step 2: Convert to fraction form
    13.31/19.88 = 11.86/x
  3. Step 3: Cross multiply
    13.31x = 19.88 × 11.86
  4. Step 4: Simplify right side
    13.31x = 235.82
  5. Step 5: Solve for x
    x = 235.82/13.31
  6. Step 6: Final answer
    x = 17.71

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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.