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Finding the Fourth Proportional to 16.21, 24.40 and 12.43

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Solution

The fourth proportional to 16.21, 24.40 and 12.43 is: 18.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.21 : 24.40 = 12.43 : x
  2. Step 2: Convert to fraction form
    16.21/24.40 = 12.43/x
  3. Step 3: Cross multiply
    16.21x = 24.40 × 12.43
  4. Step 4: Simplify right side
    16.21x = 303.29
  5. Step 5: Solve for x
    x = 303.29/16.21
  6. Step 6: Final answer
    x = 18.71

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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.