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Finding the Fourth Proportional to 694.10, 957.88 and 399.36

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Solution

The fourth proportional to 694.10, 957.88 and 399.36 is: 551.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.10 : 957.88 = 399.36 : x
  2. Step 2: Convert to fraction form
    694.10/957.88 = 399.36/x
  3. Step 3: Cross multiply
    694.10x = 957.88 × 399.36
  4. Step 4: Simplify right side
    694.10x = 382,538.96
  5. Step 5: Solve for x
    x = 382,538.96/694.10
  6. Step 6: Final answer
    x = 551.13

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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.