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Finding the Fourth Proportional to 84.75, 116.81 and 67.34

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Solution

The fourth proportional to 84.75, 116.81 and 67.34 is: 92.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.75 : 116.81 = 67.34 : x
  2. Step 2: Convert to fraction form
    84.75/116.81 = 67.34/x
  3. Step 3: Cross multiply
    84.75x = 116.81 × 67.34
  4. Step 4: Simplify right side
    84.75x = 7,865.40
  5. Step 5: Solve for x
    x = 7,865.40/84.75
  6. Step 6: Final answer
    x = 92.81

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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.