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Finding the Fourth Proportional to 67.09, 92.62 and 65.85

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Solution

The fourth proportional to 67.09, 92.62 and 65.85 is: 90.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.09 : 92.62 = 65.85 : x
  2. Step 2: Convert to fraction form
    67.09/92.62 = 65.85/x
  3. Step 3: Cross multiply
    67.09x = 92.62 × 65.85
  4. Step 4: Simplify right side
    67.09x = 6,099.03
  5. Step 5: Solve for x
    x = 6,099.03/67.09
  6. Step 6: Final answer
    x = 90.91

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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.