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Finding the Fourth Proportional to 181.20, 249.87 and 161.55

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Solution

The fourth proportional to 181.20, 249.87 and 161.55 is: 222.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.20 : 249.87 = 161.55 : x
  2. Step 2: Convert to fraction form
    181.20/249.87 = 161.55/x
  3. Step 3: Cross multiply
    181.20x = 249.87 × 161.55
  4. Step 4: Simplify right side
    181.20x = 40,366.50
  5. Step 5: Solve for x
    x = 40,366.50/181.20
  6. Step 6: Final answer
    x = 222.77

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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.