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Finding the Fourth Proportional to 84.22, 126.28 and 71.46

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Solution

The fourth proportional to 84.22, 126.28 and 71.46 is: 107.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.22 : 126.28 = 71.46 : x
  2. Step 2: Convert to fraction form
    84.22/126.28 = 71.46/x
  3. Step 3: Cross multiply
    84.22x = 126.28 × 71.46
  4. Step 4: Simplify right side
    84.22x = 9,023.97
  5. Step 5: Solve for x
    x = 9,023.97/84.22
  6. Step 6: Final answer
    x = 107.15

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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.