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Finding the Fourth Proportional to 443.10, 664.65 and 394.57

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Solution

The fourth proportional to 443.10, 664.65 and 394.57 is: 591.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.10 : 664.65 = 394.57 : x
  2. Step 2: Convert to fraction form
    443.10/664.65 = 394.57/x
  3. Step 3: Cross multiply
    443.10x = 664.65 × 394.57
  4. Step 4: Simplify right side
    443.10x = 262,248.98
  5. Step 5: Solve for x
    x = 262,248.98/443.10
  6. Step 6: Final answer
    x = 591.86

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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.