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Finding the Fourth Proportional to 18.55, 27.71 and 16.87

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Solution

The fourth proportional to 18.55, 27.71 and 16.87 is: 25.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.55 : 27.71 = 16.87 : x
  2. Step 2: Convert to fraction form
    18.55/27.71 = 16.87/x
  3. Step 3: Cross multiply
    18.55x = 27.71 × 16.87
  4. Step 4: Simplify right side
    18.55x = 467.38
  5. Step 5: Solve for x
    x = 467.38/18.55
  6. Step 6: Final answer
    x = 25.20

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.