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Finding the Fourth Proportional to 252.11, 378.27 and 206.55

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Solution

The fourth proportional to 252.11, 378.27 and 206.55 is: 309.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.11 : 378.27 = 206.55 : x
  2. Step 2: Convert to fraction form
    252.11/378.27 = 206.55/x
  3. Step 3: Cross multiply
    252.11x = 378.27 × 206.55
  4. Step 4: Simplify right side
    252.11x = 78,131.67
  5. Step 5: Solve for x
    x = 78,131.67/252.11
  6. Step 6: Final answer
    x = 309.91

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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.