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Finding the Fourth Proportional to 608.87, 839.94 and 398.97

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Solution

The fourth proportional to 608.87, 839.94 and 398.97 is: 550.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.87 : 839.94 = 398.97 : x
  2. Step 2: Convert to fraction form
    608.87/839.94 = 398.97/x
  3. Step 3: Cross multiply
    608.87x = 839.94 × 398.97
  4. Step 4: Simplify right side
    608.87x = 335,110.86
  5. Step 5: Solve for x
    x = 335,110.86/608.87
  6. Step 6: Final answer
    x = 550.39

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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.