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Finding the Fourth Proportional to 412.87, 620.16 and 399.03

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Solution

The fourth proportional to 412.87, 620.16 and 399.03 is: 599.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    412.87 : 620.16 = 399.03 : x
  2. Step 2: Convert to fraction form
    412.87/620.16 = 399.03/x
  3. Step 3: Cross multiply
    412.87x = 620.16 × 399.03
  4. Step 4: Simplify right side
    412.87x = 247,462.44
  5. Step 5: Solve for x
    x = 247,462.44/412.87
  6. Step 6: Final answer
    x = 599.37

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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.