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Finding the Fourth Proportional to 136.85, 188.78 and 112.25

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Solution

The fourth proportional to 136.85, 188.78 and 112.25 is: 154.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.85 : 188.78 = 112.25 : x
  2. Step 2: Convert to fraction form
    136.85/188.78 = 112.25/x
  3. Step 3: Cross multiply
    136.85x = 188.78 × 112.25
  4. Step 4: Simplify right side
    136.85x = 21,190.47
  5. Step 5: Solve for x
    x = 21,190.47/136.85
  6. Step 6: Final answer
    x = 154.85

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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.