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Finding the Fourth Proportional to 67.90, 92.73 and 67.18

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Solution

The fourth proportional to 67.90, 92.73 and 67.18 is: 91.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.90 : 92.73 = 67.18 : x
  2. Step 2: Convert to fraction form
    67.90/92.73 = 67.18/x
  3. Step 3: Cross multiply
    67.90x = 92.73 × 67.18
  4. Step 4: Simplify right side
    67.90x = 6,229.60
  5. Step 5: Solve for x
    x = 6,229.60/67.90
  6. Step 6: Final answer
    x = 91.75

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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.