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Finding the Fourth Proportional to 443.87, 663.21 and 390.41

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Solution

The fourth proportional to 443.87, 663.21 and 390.41 is: 583.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    443.87 : 663.21 = 390.41 : x
  2. Step 2: Convert to fraction form
    443.87/663.21 = 390.41/x
  3. Step 3: Cross multiply
    443.87x = 663.21 × 390.41
  4. Step 4: Simplify right side
    443.87x = 258,923.82
  5. Step 5: Solve for x
    x = 258,923.82/443.87
  6. Step 6: Final answer
    x = 583.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.