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Finding the Fourth Proportional to 26.72, 40.11 and 15.91

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Solution

The fourth proportional to 26.72, 40.11 and 15.91 is: 23.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.72 : 40.11 = 15.91 : x
  2. Step 2: Convert to fraction form
    26.72/40.11 = 15.91/x
  3. Step 3: Cross multiply
    26.72x = 40.11 × 15.91
  4. Step 4: Simplify right side
    26.72x = 638.15
  5. Step 5: Solve for x
    x = 638.15/26.72
  6. Step 6: Final answer
    x = 23.88

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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.