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Finding the Fourth Proportional to 252.12, 378.02 and 107.76

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Solution

The fourth proportional to 252.12, 378.02 and 107.76 is: 161.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.12 : 378.02 = 107.76 : x
  2. Step 2: Convert to fraction form
    252.12/378.02 = 107.76/x
  3. Step 3: Cross multiply
    252.12x = 378.02 × 107.76
  4. Step 4: Simplify right side
    252.12x = 40,735.44
  5. Step 5: Solve for x
    x = 40,735.44/252.12
  6. Step 6: Final answer
    x = 161.57

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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.