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Finding the Fourth Proportional to 18.14, 25.08 and 15.71

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Solution

The fourth proportional to 18.14, 25.08 and 15.71 is: 21.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.14 : 25.08 = 15.71 : x
  2. Step 2: Convert to fraction form
    18.14/25.08 = 15.71/x
  3. Step 3: Cross multiply
    18.14x = 25.08 × 15.71
  4. Step 4: Simplify right side
    18.14x = 394.01
  5. Step 5: Solve for x
    x = 394.01/18.14
  6. Step 6: Final answer
    x = 21.72

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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.