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Finding the Fourth Proportional to 640.86, 884.36 and 361.15

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Solution

The fourth proportional to 640.86, 884.36 and 361.15 is: 498.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.86 : 884.36 = 361.15 : x
  2. Step 2: Convert to fraction form
    640.86/884.36 = 361.15/x
  3. Step 3: Cross multiply
    640.86x = 884.36 × 361.15
  4. Step 4: Simplify right side
    640.86x = 319,384.44
  5. Step 5: Solve for x
    x = 319,384.44/640.86
  6. Step 6: Final answer
    x = 498.37

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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.