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Finding the Fourth Proportional to 251.87, 378.08 and 107.69

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Solution

The fourth proportional to 251.87, 378.08 and 107.69 is: 161.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    251.87 : 378.08 = 107.69 : x
  2. Step 2: Convert to fraction form
    251.87/378.08 = 107.69/x
  3. Step 3: Cross multiply
    251.87x = 378.08 × 107.69
  4. Step 4: Simplify right side
    251.87x = 40,714.90
  5. Step 5: Solve for x
    x = 40,714.90/251.87
  6. Step 6: Final answer
    x = 161.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.