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Finding the Fourth Proportional to 136.35, 188.19 and 86.60

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Solution

The fourth proportional to 136.35, 188.19 and 86.60 is: 119.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.35 : 188.19 = 86.60 : x
  2. Step 2: Convert to fraction form
    136.35/188.19 = 86.60/x
  3. Step 3: Cross multiply
    136.35x = 188.19 × 86.60
  4. Step 4: Simplify right side
    136.35x = 16,297.72
  5. Step 5: Solve for x
    x = 16,297.72/136.35
  6. Step 6: Final answer
    x = 119.53

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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.