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Finding the Fourth Proportional to 92.72, 139.09 and 38.60

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Solution

The fourth proportional to 92.72, 139.09 and 38.60 is: 57.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.72 : 139.09 = 38.60 : x
  2. Step 2: Convert to fraction form
    92.72/139.09 = 38.60/x
  3. Step 3: Cross multiply
    92.72x = 139.09 × 38.60
  4. Step 4: Simplify right side
    92.72x = 5,369.18
  5. Step 5: Solve for x
    x = 5,369.18/92.72
  6. Step 6: Final answer
    x = 57.91

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.