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Finding the Fourth Proportional to 16.68, 25.11 and 15.42

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Solution

The fourth proportional to 16.68, 25.11 and 15.42 is: 23.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.68 : 25.11 = 15.42 : x
  2. Step 2: Convert to fraction form
    16.68/25.11 = 15.42/x
  3. Step 3: Cross multiply
    16.68x = 25.11 × 15.42
  4. Step 4: Simplify right side
    16.68x = 387.20
  5. Step 5: Solve for x
    x = 387.20/16.68
  6. Step 6: Final answer
    x = 23.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.