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Finding the Fourth Proportional to 111.71, 154.19 and 82.22

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Solution

The fourth proportional to 111.71, 154.19 and 82.22 is: 113.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.71 : 154.19 = 82.22 : x
  2. Step 2: Convert to fraction form
    111.71/154.19 = 82.22/x
  3. Step 3: Cross multiply
    111.71x = 154.19 × 82.22
  4. Step 4: Simplify right side
    111.71x = 12,676.32
  5. Step 5: Solve for x
    x = 12,676.32/111.71
  6. Step 6: Final answer
    x = 113.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.