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Finding the Fourth Proportional to 84.09, 126.12 and 23.21

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Solution

The fourth proportional to 84.09, 126.12 and 23.21 is: 34.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.09 : 126.12 = 23.21 : x
  2. Step 2: Convert to fraction form
    84.09/126.12 = 23.21/x
  3. Step 3: Cross multiply
    84.09x = 126.12 × 23.21
  4. Step 4: Simplify right side
    84.09x = 2,926.85
  5. Step 5: Solve for x
    x = 2,926.85/84.09
  6. Step 6: Final answer
    x = 34.81

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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.