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Finding the Fourth Proportional to 361.78, 499.28 and 283.20

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Solution

The fourth proportional to 361.78, 499.28 and 283.20 is: 390.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.78 : 499.28 = 283.20 : x
  2. Step 2: Convert to fraction form
    361.78/499.28 = 283.20/x
  3. Step 3: Cross multiply
    361.78x = 499.28 × 283.20
  4. Step 4: Simplify right side
    361.78x = 141,396.10
  5. Step 5: Solve for x
    x = 141,396.10/361.78
  6. Step 6: Final answer
    x = 390.83

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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.