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Finding the Fourth Proportional to 694.20, 957.87 and 399.45

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Solution

The fourth proportional to 694.20, 957.87 and 399.45 is: 551.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    694.20 : 957.87 = 399.45 : x
  2. Step 2: Convert to fraction form
    694.20/957.87 = 399.45/x
  3. Step 3: Cross multiply
    694.20x = 957.87 × 399.45
  4. Step 4: Simplify right side
    694.20x = 382,621.17
  5. Step 5: Solve for x
    x = 382,621.17/694.20
  6. Step 6: Final answer
    x = 551.17

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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.