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Finding the Fourth Proportional to 694.36, 958.19 and 399.68

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Solution

The fourth proportional to 694.36, 958.19 and 399.68 is: 551.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.36 : 958.19 = 399.68 : x
  2. Step 2: Convert to fraction form
    694.36/958.19 = 399.68/x
  3. Step 3: Cross multiply
    694.36x = 958.19 × 399.68
  4. Step 4: Simplify right side
    694.36x = 382,968.43
  5. Step 5: Solve for x
    x = 382,968.43/694.36
  6. Step 6: Final answer
    x = 551.54

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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.