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Finding the Fourth Proportional to 16.38, 22.60 and 9.91

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Solution

The fourth proportional to 16.38, 22.60 and 9.91 is: 13.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.38 : 22.60 = 9.91 : x
  2. Step 2: Convert to fraction form
    16.38/22.60 = 9.91/x
  3. Step 3: Cross multiply
    16.38x = 22.60 × 9.91
  4. Step 4: Simplify right side
    16.38x = 223.88
  5. Step 5: Solve for x
    x = 223.88/16.38
  6. Step 6: Final answer
    x = 13.67

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.