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Finding the Fourth Proportional to 84.15, 115.73 and 67.75

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Solution

The fourth proportional to 84.15, 115.73 and 67.75 is: 93.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    84.15 : 115.73 = 67.75 : x
  2. Step 2: Convert to fraction form
    84.15/115.73 = 67.75/x
  3. Step 3: Cross multiply
    84.15x = 115.73 × 67.75
  4. Step 4: Simplify right side
    84.15x = 7,840.33
  5. Step 5: Solve for x
    x = 7,840.33/84.15
  6. Step 6: Final answer
    x = 93.17

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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.