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Finding the Fourth Proportional to 445.64, 667.98 and 394.42

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Solution

The fourth proportional to 445.64, 667.98 and 394.42 is: 591.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    445.64 : 667.98 = 394.42 : x
  2. Step 2: Convert to fraction form
    445.64/667.98 = 394.42/x
  3. Step 3: Cross multiply
    445.64x = 667.98 × 394.42
  4. Step 4: Simplify right side
    445.64x = 263,464.67
  5. Step 5: Solve for x
    x = 263,464.67/445.64
  6. Step 6: Final answer
    x = 591.21

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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.