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Finding the Fourth Proportional to 268.10, 369.90 and 163.20

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Solution

The fourth proportional to 268.10, 369.90 and 163.20 is: 225.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    268.10 : 369.90 = 163.20 : x
  2. Step 2: Convert to fraction form
    268.10/369.90 = 163.20/x
  3. Step 3: Cross multiply
    268.10x = 369.90 × 163.20
  4. Step 4: Simplify right side
    268.10x = 60,367.68
  5. Step 5: Solve for x
    x = 60,367.68/268.10
  6. Step 6: Final answer
    x = 225.17

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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.