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Finding the Fourth Proportional to 16.89, 25.36 and 12.39

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Solution

The fourth proportional to 16.89, 25.36 and 12.39 is: 18.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.89 : 25.36 = 12.39 : x
  2. Step 2: Convert to fraction form
    16.89/25.36 = 12.39/x
  3. Step 3: Cross multiply
    16.89x = 25.36 × 12.39
  4. Step 4: Simplify right side
    16.89x = 314.15
  5. Step 5: Solve for x
    x = 314.15/16.89
  6. Step 6: Final answer
    x = 18.60

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.