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Finding the Fourth Proportional to 136.10, 187.81 and 80.84

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Solution

The fourth proportional to 136.10, 187.81 and 80.84 is: 111.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    136.10 : 187.81 = 80.84 : x
  2. Step 2: Convert to fraction form
    136.10/187.81 = 80.84/x
  3. Step 3: Cross multiply
    136.10x = 187.81 × 80.84
  4. Step 4: Simplify right side
    136.10x = 15,181.91
  5. Step 5: Solve for x
    x = 15,181.91/136.10
  6. Step 6: Final answer
    x = 111.55

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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.