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Finding the Fourth Proportional to 694.48, 958.41 and 399.76

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Solution

The fourth proportional to 694.48, 958.41 and 399.76 is: 551.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.48 : 958.41 = 399.76 : x
  2. Step 2: Convert to fraction form
    694.48/958.41 = 399.76/x
  3. Step 3: Cross multiply
    694.48x = 958.41 × 399.76
  4. Step 4: Simplify right side
    694.48x = 383,133.98
  5. Step 5: Solve for x
    x = 383,133.98/694.48
  6. Step 6: Final answer
    x = 551.68

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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.