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Finding the Fourth Proportional to 84.22, 126.28 and 30.09

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Solution

The fourth proportional to 84.22, 126.28 and 30.09 is: 45.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.22 : 126.28 = 30.09 : x
  2. Step 2: Convert to fraction form
    84.22/126.28 = 30.09/x
  3. Step 3: Cross multiply
    84.22x = 126.28 × 30.09
  4. Step 4: Simplify right side
    84.22x = 3,799.77
  5. Step 5: Solve for x
    x = 3,799.77/84.22
  6. Step 6: Final answer
    x = 45.12

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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.