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Finding the Fourth Proportional to 408.16, 561.85 and 394.82

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Solution

The fourth proportional to 408.16, 561.85 and 394.82 is: 543.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.16 : 561.85 = 394.82 : x
  2. Step 2: Convert to fraction form
    408.16/561.85 = 394.82/x
  3. Step 3: Cross multiply
    408.16x = 561.85 × 394.82
  4. Step 4: Simplify right side
    408.16x = 221,830.03
  5. Step 5: Solve for x
    x = 221,830.03/408.16
  6. Step 6: Final answer
    x = 543.49

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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.