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Finding the Fourth Proportional to 18.40, 27.52 and 11.28

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Solution

The fourth proportional to 18.40, 27.52 and 11.28 is: 16.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.40 : 27.52 = 11.28 : x
  2. Step 2: Convert to fraction form
    18.40/27.52 = 11.28/x
  3. Step 3: Cross multiply
    18.40x = 27.52 × 11.28
  4. Step 4: Simplify right side
    18.40x = 310.43
  5. Step 5: Solve for x
    x = 310.43/18.40
  6. Step 6: Final answer
    x = 16.87

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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.