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Finding the Fourth Proportional to 18.86, 25.97 and 16.43

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Solution

The fourth proportional to 18.86, 25.97 and 16.43 is: 22.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.86 : 25.97 = 16.43 : x
  2. Step 2: Convert to fraction form
    18.86/25.97 = 16.43/x
  3. Step 3: Cross multiply
    18.86x = 25.97 × 16.43
  4. Step 4: Simplify right side
    18.86x = 426.48
  5. Step 5: Solve for x
    x = 426.48/18.86
  6. Step 6: Final answer
    x = 22.62

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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.