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Finding the Fourth Proportional to 361.72, 498.91 and 255.20

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Solution

The fourth proportional to 361.72, 498.91 and 255.20 is: 351.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    361.72 : 498.91 = 255.20 : x
  2. Step 2: Convert to fraction form
    361.72/498.91 = 255.20/x
  3. Step 3: Cross multiply
    361.72x = 498.91 × 255.20
  4. Step 4: Simplify right side
    361.72x = 127,321.98
  5. Step 5: Solve for x
    x = 127,321.98/361.72
  6. Step 6: Final answer
    x = 351.99

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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.