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Finding the Fourth Proportional to 641.28, 884.88 and 361.44

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Solution

The fourth proportional to 641.28, 884.88 and 361.44 is: 498.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.28 : 884.88 = 361.44 : x
  2. Step 2: Convert to fraction form
    641.28/884.88 = 361.44/x
  3. Step 3: Cross multiply
    641.28x = 884.88 × 361.44
  4. Step 4: Simplify right side
    641.28x = 319,831.03
  5. Step 5: Solve for x
    x = 319,831.03/641.28
  6. Step 6: Final answer
    x = 498.74

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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.