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Finding the Fourth Proportional to 181.09, 249.70 and 131.20

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Solution

The fourth proportional to 181.09, 249.70 and 131.20 is: 180.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.09 : 249.70 = 131.20 : x
  2. Step 2: Convert to fraction form
    181.09/249.70 = 131.20/x
  3. Step 3: Cross multiply
    181.09x = 249.70 × 131.20
  4. Step 4: Simplify right side
    181.09x = 32,761.09
  5. Step 5: Solve for x
    x = 32,761.09/181.09
  6. Step 6: Final answer
    x = 180.91

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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.