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Finding the Fourth Proportional to 408.92, 564.21 and 284.84

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Solution

The fourth proportional to 408.92, 564.21 and 284.84 is: 393.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.92 : 564.21 = 284.84 : x
  2. Step 2: Convert to fraction form
    408.92/564.21 = 284.84/x
  3. Step 3: Cross multiply
    408.92x = 564.21 × 284.84
  4. Step 4: Simplify right side
    408.92x = 160,709.58
  5. Step 5: Solve for x
    x = 160,709.58/408.92
  6. Step 6: Final answer
    x = 393.01

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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.