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Finding the Fourth Proportional to 398.99, 550.58 and 268.22

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Solution

The fourth proportional to 398.99, 550.58 and 268.22 is: 370.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.99 : 550.58 = 268.22 : x
  2. Step 2: Convert to fraction form
    398.99/550.58 = 268.22/x
  3. Step 3: Cross multiply
    398.99x = 550.58 × 268.22
  4. Step 4: Simplify right side
    398.99x = 147,672.47
  5. Step 5: Solve for x
    x = 147,672.47/398.99
  6. Step 6: Final answer
    x = 370.12

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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.