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Finding the Fourth Proportional to 361.74, 499.12 and 221.88

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Solution

The fourth proportional to 361.74, 499.12 and 221.88 is: 306.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.74 : 499.12 = 221.88 : x
  2. Step 2: Convert to fraction form
    361.74/499.12 = 221.88/x
  3. Step 3: Cross multiply
    361.74x = 499.12 × 221.88
  4. Step 4: Simplify right side
    361.74x = 110,744.75
  5. Step 5: Solve for x
    x = 110,744.75/361.74
  6. Step 6: Final answer
    x = 306.14

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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.