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Finding the Fourth Proportional to 18.11, 25.02 and 15.55

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Solution

The fourth proportional to 18.11, 25.02 and 15.55 is: 21.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.11 : 25.02 = 15.55 : x
  2. Step 2: Convert to fraction form
    18.11/25.02 = 15.55/x
  3. Step 3: Cross multiply
    18.11x = 25.02 × 15.55
  4. Step 4: Simplify right side
    18.11x = 389.00
  5. Step 5: Solve for x
    x = 389.00/18.11
  6. Step 6: Final answer
    x = 21.48

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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.