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Finding the Fourth Proportional to 67.29, 92.88 and 39.66

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Solution

The fourth proportional to 67.29, 92.88 and 39.66 is: 54.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    67.29 : 92.88 = 39.66 : x
  2. Step 2: Convert to fraction form
    67.29/92.88 = 39.66/x
  3. Step 3: Cross multiply
    67.29x = 92.88 × 39.66
  4. Step 4: Simplify right side
    67.29x = 3,683.62
  5. Step 5: Solve for x
    x = 3,683.62/67.29
  6. Step 6: Final answer
    x = 54.74

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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.