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Finding the Fourth Proportional to 16.66, 25.06 and 12.21

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Solution

The fourth proportional to 16.66, 25.06 and 12.21 is: 18.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    16.66 : 25.06 = 12.21 : x
  2. Step 2: Convert to fraction form
    16.66/25.06 = 12.21/x
  3. Step 3: Cross multiply
    16.66x = 25.06 × 12.21
  4. Step 4: Simplify right side
    16.66x = 305.98
  5. Step 5: Solve for x
    x = 305.98/16.66
  6. Step 6: Final answer
    x = 18.37

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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.