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Finding the Fourth Proportional to 262.92, 394.30 and 205.21

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Solution

The fourth proportional to 262.92, 394.30 and 205.21 is: 307.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.92 : 394.30 = 205.21 : x
  2. Step 2: Convert to fraction form
    262.92/394.30 = 205.21/x
  3. Step 3: Cross multiply
    262.92x = 394.30 × 205.21
  4. Step 4: Simplify right side
    262.92x = 80,914.30
  5. Step 5: Solve for x
    x = 80,914.30/262.92
  6. Step 6: Final answer
    x = 307.75

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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.