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Finding the Fourth Proportional to 641.49, 885.23 and 361.77

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Solution

The fourth proportional to 641.49, 885.23 and 361.77 is: 499.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.49 : 885.23 = 361.77 : x
  2. Step 2: Convert to fraction form
    641.49/885.23 = 361.77/x
  3. Step 3: Cross multiply
    641.49x = 885.23 × 361.77
  4. Step 4: Simplify right side
    641.49x = 320,249.66
  5. Step 5: Solve for x
    x = 320,249.66/641.49
  6. Step 6: Final answer
    x = 499.23

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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.