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Finding the Fourth Proportional to 13.93, 20.86 and 9.91

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Solution

The fourth proportional to 13.93, 20.86 and 9.91 is: 14.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.93 : 20.86 = 9.91 : x
  2. Step 2: Convert to fraction form
    13.93/20.86 = 9.91/x
  3. Step 3: Cross multiply
    13.93x = 20.86 × 9.91
  4. Step 4: Simplify right side
    13.93x = 206.72
  5. Step 5: Solve for x
    x = 206.72/13.93
  6. Step 6: Final answer
    x = 14.84

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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.