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Finding the Fourth Proportional to 361.20, 540.45 and 214.42

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Solution

The fourth proportional to 361.20, 540.45 and 214.42 is: 320.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.20 : 540.45 = 214.42 : x
  2. Step 2: Convert to fraction form
    361.20/540.45 = 214.42/x
  3. Step 3: Cross multiply
    361.20x = 540.45 × 214.42
  4. Step 4: Simplify right side
    361.20x = 115,881.94
  5. Step 5: Solve for x
    x = 115,881.94/361.20
  6. Step 6: Final answer
    x = 320.82

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.