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Finding the Fourth Proportional to 694.28, 958.11 and 399.64

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Solution

The fourth proportional to 694.28, 958.11 and 399.64 is: 551.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.28 : 958.11 = 399.64 : x
  2. Step 2: Convert to fraction form
    694.28/958.11 = 399.64/x
  3. Step 3: Cross multiply
    694.28x = 958.11 × 399.64
  4. Step 4: Simplify right side
    694.28x = 382,899.08
  5. Step 5: Solve for x
    x = 382,899.08/694.28
  6. Step 6: Final answer
    x = 551.51

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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.