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Finding the Fourth Proportional to 694.21, 957.98 and 399.47

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Solution

The fourth proportional to 694.21, 957.98 and 399.47 is: 551.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.21 : 957.98 = 399.47 : x
  2. Step 2: Convert to fraction form
    694.21/957.98 = 399.47/x
  3. Step 3: Cross multiply
    694.21x = 957.98 × 399.47
  4. Step 4: Simplify right side
    694.21x = 382,684.27
  5. Step 5: Solve for x
    x = 382,684.27/694.21
  6. Step 6: Final answer
    x = 551.25

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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.