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Finding the Fourth Proportional to 262.20, 361.49 and 217.78

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Solution

The fourth proportional to 262.20, 361.49 and 217.78 is: 300.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    262.20 : 361.49 = 217.78 : x
  2. Step 2: Convert to fraction form
    262.20/361.49 = 217.78/x
  3. Step 3: Cross multiply
    262.20x = 361.49 × 217.78
  4. Step 4: Simplify right side
    262.20x = 78,725.29
  5. Step 5: Solve for x
    x = 78,725.29/262.20
  6. Step 6: Final answer
    x = 300.25

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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.