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Finding the Fourth Proportional to 608.92, 840.01 and 399

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Solution

The fourth proportional to 608.92, 840.01 and 399 is: 550.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.92 : 840.01 = 399 : x
  2. Step 2: Convert to fraction form
    608.92/840.01 = 399/x
  3. Step 3: Cross multiply
    608.92x = 840.01 × 399
  4. Step 4: Simplify right side
    608.92x = 335,163.99
  5. Step 5: Solve for x
    x = 335,163.99/608.92
  6. Step 6: Final answer
    x = 550.43

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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.