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Finding the Fourth Proportional to 136.20, 187.74 and 111.60

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Solution

The fourth proportional to 136.20, 187.74 and 111.60 is: 153.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.20 : 187.74 = 111.60 : x
  2. Step 2: Convert to fraction form
    136.20/187.74 = 111.60/x
  3. Step 3: Cross multiply
    136.20x = 187.74 × 111.60
  4. Step 4: Simplify right side
    136.20x = 20,951.78
  5. Step 5: Solve for x
    x = 20,951.78/136.20
  6. Step 6: Final answer
    x = 153.83

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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.