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Finding the Fourth Proportional to 136.69, 188.78 and 92.95

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Solution

The fourth proportional to 136.69, 188.78 and 92.95 is: 128.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.69 : 188.78 = 92.95 : x
  2. Step 2: Convert to fraction form
    136.69/188.78 = 92.95/x
  3. Step 3: Cross multiply
    136.69x = 188.78 × 92.95
  4. Step 4: Simplify right side
    136.69x = 17,546.69
  5. Step 5: Solve for x
    x = 17,546.69/136.69
  6. Step 6: Final answer
    x = 128.37

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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.