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Finding the Fourth Proportional to 398.64, 550.32 and 266.09

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Solution

The fourth proportional to 398.64, 550.32 and 266.09 is: 367.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.64 : 550.32 = 266.09 : x
  2. Step 2: Convert to fraction form
    398.64/550.32 = 266.09/x
  3. Step 3: Cross multiply
    398.64x = 550.32 × 266.09
  4. Step 4: Simplify right side
    398.64x = 146,434.65
  5. Step 5: Solve for x
    x = 146,434.65/398.64
  6. Step 6: Final answer
    x = 367.34

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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.