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Finding the Fourth Proportional to 398.91, 550.65 and 268.29

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Solution

The fourth proportional to 398.91, 550.65 and 268.29 is: 370.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.91 : 550.65 = 268.29 : x
  2. Step 2: Convert to fraction form
    398.91/550.65 = 268.29/x
  3. Step 3: Cross multiply
    398.91x = 550.65 × 268.29
  4. Step 4: Simplify right side
    398.91x = 147,733.89
  5. Step 5: Solve for x
    x = 147,733.89/398.91
  6. Step 6: Final answer
    x = 370.34

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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.