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Finding the Fourth Proportional to 16.87, 25.15 and 15.84

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Solution

The fourth proportional to 16.87, 25.15 and 15.84 is: 23.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.87 : 25.15 = 15.84 : x
  2. Step 2: Convert to fraction form
    16.87/25.15 = 15.84/x
  3. Step 3: Cross multiply
    16.87x = 25.15 × 15.84
  4. Step 4: Simplify right side
    16.87x = 398.38
  5. Step 5: Solve for x
    x = 398.38/16.87
  6. Step 6: Final answer
    x = 23.61

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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.