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Finding the Fourth Proportional to 84.74, 126.39 and 82.18

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Solution

The fourth proportional to 84.74, 126.39 and 82.18 is: 122.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.74 : 126.39 = 82.18 : x
  2. Step 2: Convert to fraction form
    84.74/126.39 = 82.18/x
  3. Step 3: Cross multiply
    84.74x = 126.39 × 82.18
  4. Step 4: Simplify right side
    84.74x = 10,386.49
  5. Step 5: Solve for x
    x = 10,386.49/84.74
  6. Step 6: Final answer
    x = 122.57

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.