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Finding the Fourth Proportional to 139.18, 192.15 and 92.61

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Solution

The fourth proportional to 139.18, 192.15 and 92.61 is: 127.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.18 : 192.15 = 92.61 : x
  2. Step 2: Convert to fraction form
    139.18/192.15 = 92.61/x
  3. Step 3: Cross multiply
    139.18x = 192.15 × 92.61
  4. Step 4: Simplify right side
    139.18x = 17,795.38
  5. Step 5: Solve for x
    x = 17,795.38/139.18
  6. Step 6: Final answer
    x = 127.86

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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.