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Finding the Fourth Proportional to 694.30, 958.11 and 399.55

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Solution

The fourth proportional to 694.30, 958.11 and 399.55 is: 551.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.30 : 958.11 = 399.55 : x
  2. Step 2: Convert to fraction form
    694.30/958.11 = 399.55/x
  3. Step 3: Cross multiply
    694.30x = 958.11 × 399.55
  4. Step 4: Simplify right side
    694.30x = 382,812.85
  5. Step 5: Solve for x
    x = 382,812.85/694.30
  6. Step 6: Final answer
    x = 551.37

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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.