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Finding the Fourth Proportional to 181.38, 251.45 and 172

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Solution

The fourth proportional to 181.38, 251.45 and 172 is: 238.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.38 : 251.45 = 172 : x
  2. Step 2: Convert to fraction form
    181.38/251.45 = 172/x
  3. Step 3: Cross multiply
    181.38x = 251.45 × 172
  4. Step 4: Simplify right side
    181.38x = 43,249.40
  5. Step 5: Solve for x
    x = 43,249.40/181.38
  6. Step 6: Final answer
    x = 238.45

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.