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Finding the Fourth Proportional to 121.42, 182.14 and 80.84

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Solution

The fourth proportional to 121.42, 182.14 and 80.84 is: 121.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.42 : 182.14 = 80.84 : x
  2. Step 2: Convert to fraction form
    121.42/182.14 = 80.84/x
  3. Step 3: Cross multiply
    121.42x = 182.14 × 80.84
  4. Step 4: Simplify right side
    121.42x = 14,724.20
  5. Step 5: Solve for x
    x = 14,724.20/121.42
  6. Step 6: Final answer
    x = 121.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.