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Finding the Fourth Proportional to 18.88, 25.99 and 15.81

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Solution

The fourth proportional to 18.88, 25.99 and 15.81 is: 21.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.88 : 25.99 = 15.81 : x
  2. Step 2: Convert to fraction form
    18.88/25.99 = 15.81/x
  3. Step 3: Cross multiply
    18.88x = 25.99 × 15.81
  4. Step 4: Simplify right side
    18.88x = 410.90
  5. Step 5: Solve for x
    x = 410.90/18.88
  6. Step 6: Final answer
    x = 21.76

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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.