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Finding the Fourth Proportional to 408.65, 563.36 and 261

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Solution

The fourth proportional to 408.65, 563.36 and 261 is: 359.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.65 : 563.36 = 261 : x
  2. Step 2: Convert to fraction form
    408.65/563.36 = 261/x
  3. Step 3: Cross multiply
    408.65x = 563.36 × 261
  4. Step 4: Simplify right side
    408.65x = 147,035.66
  5. Step 5: Solve for x
    x = 147,035.66/408.65
  6. Step 6: Final answer
    x = 359.81

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.