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Finding the Fourth Proportional to 641.44, 885.24 and 361.66

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Solution

The fourth proportional to 641.44, 885.24 and 361.66 is: 499.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.44 : 885.24 = 361.66 : x
  2. Step 2: Convert to fraction form
    641.44/885.24 = 361.66/x
  3. Step 3: Cross multiply
    641.44x = 885.24 × 361.66
  4. Step 4: Simplify right side
    641.44x = 320,155.90
  5. Step 5: Solve for x
    x = 320,155.90/641.44
  6. Step 6: Final answer
    x = 499.12

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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.