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Finding the Fourth Proportional to 66.73, 92.10 and 39.09

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Solution

The fourth proportional to 66.73, 92.10 and 39.09 is: 53.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.73 : 92.10 = 39.09 : x
  2. Step 2: Convert to fraction form
    66.73/92.10 = 39.09/x
  3. Step 3: Cross multiply
    66.73x = 92.10 × 39.09
  4. Step 4: Simplify right side
    66.73x = 3,600.19
  5. Step 5: Solve for x
    x = 3,600.19/66.73
  6. Step 6: Final answer
    x = 53.95

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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.