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Finding the Fourth Proportional to 399.40, 550.96 and 268.18

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Solution

The fourth proportional to 399.40, 550.96 and 268.18 is: 369.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.40 : 550.96 = 268.18 : x
  2. Step 2: Convert to fraction form
    399.40/550.96 = 268.18/x
  3. Step 3: Cross multiply
    399.40x = 550.96 × 268.18
  4. Step 4: Simplify right side
    399.40x = 147,754.40
  5. Step 5: Solve for x
    x = 147,754.40/399.40
  6. Step 6: Final answer
    x = 369.94

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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.