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Finding the Fourth Proportional to 203.81, 305.49 and 82.00

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Solution

The fourth proportional to 203.81, 305.49 and 82.00 is: 122.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    203.81 : 305.49 = 82.00 : x
  2. Step 2: Convert to fraction form
    203.81/305.49 = 82.00/x
  3. Step 3: Cross multiply
    203.81x = 305.49 × 82.00
  4. Step 4: Simplify right side
    203.81x = 25,048.65
  5. Step 5: Solve for x
    x = 25,048.65/203.81
  6. Step 6: Final answer
    x = 122.90

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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.