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Finding the Fourth Proportional to 67.92, 93.25 and 66.90

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Solution

The fourth proportional to 67.92, 93.25 and 66.90 is: 91.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.92 : 93.25 = 66.90 : x
  2. Step 2: Convert to fraction form
    67.92/93.25 = 66.90/x
  3. Step 3: Cross multiply
    67.92x = 93.25 × 66.90
  4. Step 4: Simplify right side
    67.92x = 6,238.43
  5. Step 5: Solve for x
    x = 6,238.43/67.92
  6. Step 6: Final answer
    x = 91.85

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.