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Finding the Fourth Proportional to 252.20, 380.00 and 209.81

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Solution

The fourth proportional to 252.20, 380.00 and 209.81 is: 316.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.20 : 380.00 = 209.81 : x
  2. Step 2: Convert to fraction form
    252.20/380.00 = 209.81/x
  3. Step 3: Cross multiply
    252.20x = 380.00 × 209.81
  4. Step 4: Simplify right side
    252.20x = 79,724.85
  5. Step 5: Solve for x
    x = 79,724.85/252.20
  6. Step 6: Final answer
    x = 316.12

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.