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Finding the Fourth Proportional to 608.88, 839.97 and 399.30

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Solution

The fourth proportional to 608.88, 839.97 and 399.30 is: 550.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.88 : 839.97 = 399.30 : x
  2. Step 2: Convert to fraction form
    608.88/839.97 = 399.30/x
  3. Step 3: Cross multiply
    608.88x = 839.97 × 399.30
  4. Step 4: Simplify right side
    608.88x = 335,400.02
  5. Step 5: Solve for x
    x = 335,400.02/608.88
  6. Step 6: Final answer
    x = 550.85

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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.