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Finding the Fourth Proportional to 181.20, 249.90 and 122.88

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Solution

The fourth proportional to 181.20, 249.90 and 122.88 is: 169.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.20 : 249.90 = 122.88 : x
  2. Step 2: Convert to fraction form
    181.20/249.90 = 122.88/x
  3. Step 3: Cross multiply
    181.20x = 249.90 × 122.88
  4. Step 4: Simplify right side
    181.20x = 30,707.71
  5. Step 5: Solve for x
    x = 30,707.71/181.20
  6. Step 6: Final answer
    x = 169.47

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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.