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Finding the Fourth Proportional to 640.78, 884.30 and 361.03

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Solution

The fourth proportional to 640.78, 884.30 and 361.03 is: 498.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.78 : 884.30 = 361.03 : x
  2. Step 2: Convert to fraction form
    640.78/884.30 = 361.03/x
  3. Step 3: Cross multiply
    640.78x = 884.30 × 361.03
  4. Step 4: Simplify right side
    640.78x = 319,255.77
  5. Step 5: Solve for x
    x = 319,255.77/640.78
  6. Step 6: Final answer
    x = 498.23

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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.