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Finding the Fourth Proportional to 640.92, 884.48 and 361.20

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Solution

The fourth proportional to 640.92, 884.48 and 361.20 is: 498.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    640.92 : 884.48 = 361.20 : x
  2. Step 2: Convert to fraction form
    640.92/884.48 = 361.20/x
  3. Step 3: Cross multiply
    640.92x = 884.48 × 361.20
  4. Step 4: Simplify right side
    640.92x = 319,474.18
  5. Step 5: Solve for x
    x = 319,474.18/640.92
  6. Step 6: Final answer
    x = 498.46

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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.