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Finding the Fourth Proportional to 138.66, 192.66 and 137.25

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Solution

The fourth proportional to 138.66, 192.66 and 137.25 is: 190.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138.66 : 192.66 = 137.25 : x
  2. Step 2: Convert to fraction form
    138.66/192.66 = 137.25/x
  3. Step 3: Cross multiply
    138.66x = 192.66 × 137.25
  4. Step 4: Simplify right side
    138.66x = 26,442.59
  5. Step 5: Solve for x
    x = 26,442.59/138.66
  6. Step 6: Final answer
    x = 190.70

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.