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Finding the Fourth Proportional to 26.55, 39.84 and 11.91

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Solution

The fourth proportional to 26.55, 39.84 and 11.91 is: 17.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    26.55 : 39.84 = 11.91 : x
  2. Step 2: Convert to fraction form
    26.55/39.84 = 11.91/x
  3. Step 3: Cross multiply
    26.55x = 39.84 × 11.91
  4. Step 4: Simplify right side
    26.55x = 474.49
  5. Step 5: Solve for x
    x = 474.49/26.55
  6. Step 6: Final answer
    x = 17.87

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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.