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Finding the Fourth Proportional to 121.28, 181.85 and 82.82

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Solution

The fourth proportional to 121.28, 181.85 and 82.82 is: 124.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.28 : 181.85 = 82.82 : x
  2. Step 2: Convert to fraction form
    121.28/181.85 = 82.82/x
  3. Step 3: Cross multiply
    121.28x = 181.85 × 82.82
  4. Step 4: Simplify right side
    121.28x = 15,060.82
  5. Step 5: Solve for x
    x = 15,060.82/121.28
  6. Step 6: Final answer
    x = 124.18

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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.