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Finding the Fourth Proportional to 138, 206.58 and 92.04

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Solution

The fourth proportional to 138, 206.58 and 92.04 is: 137.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    138 : 206.58 = 92.04 : x
  2. Step 2: Convert to fraction form
    138/206.58 = 92.04/x
  3. Step 3: Cross multiply
    138x = 206.58 × 92.04
  4. Step 4: Simplify right side
    138x = 19,013.62
  5. Step 5: Solve for x
    x = 19,013.62/138
  6. Step 6: Final answer
    x = 137.78

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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.