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Finding the Fourth Proportional to 84.25, 126.82 and 74.33

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Solution

The fourth proportional to 84.25, 126.82 and 74.33 is: 111.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.25 : 126.82 = 74.33 : x
  2. Step 2: Convert to fraction form
    84.25/126.82 = 74.33/x
  3. Step 3: Cross multiply
    84.25x = 126.82 × 74.33
  4. Step 4: Simplify right side
    84.25x = 9,426.53
  5. Step 5: Solve for x
    x = 9,426.53/84.25
  6. Step 6: Final answer
    x = 111.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.