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Finding the Fourth Proportional to 394.42, 543.90 and 320.44

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Solution

The fourth proportional to 394.42, 543.90 and 320.44 is: 441.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.42 : 543.90 = 320.44 : x
  2. Step 2: Convert to fraction form
    394.42/543.90 = 320.44/x
  3. Step 3: Cross multiply
    394.42x = 543.90 × 320.44
  4. Step 4: Simplify right side
    394.42x = 174,287.32
  5. Step 5: Solve for x
    x = 174,287.32/394.42
  6. Step 6: Final answer
    x = 441.88

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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.