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Finding the Fourth Proportional to 15.11, 20.87 and 11.49

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Solution

The fourth proportional to 15.11, 20.87 and 11.49 is: 15.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.11 : 20.87 = 11.49 : x
  2. Step 2: Convert to fraction form
    15.11/20.87 = 11.49/x
  3. Step 3: Cross multiply
    15.11x = 20.87 × 11.49
  4. Step 4: Simplify right side
    15.11x = 239.74
  5. Step 5: Solve for x
    x = 239.74/15.11
  6. Step 6: Final answer
    x = 15.87

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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.