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Finding the Fourth Proportional to 181.85, 251.10 and 154.31

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Solution

The fourth proportional to 181.85, 251.10 and 154.31 is: 213.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    181.85 : 251.10 = 154.31 : x
  2. Step 2: Convert to fraction form
    181.85/251.10 = 154.31/x
  3. Step 3: Cross multiply
    181.85x = 251.10 × 154.31
  4. Step 4: Simplify right side
    181.85x = 38,745.99
  5. Step 5: Solve for x
    x = 38,745.99/181.85
  6. Step 6: Final answer
    x = 213.07

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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.