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Finding the Fourth Proportional to 641.67, 885.43 and 361.90

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Solution

The fourth proportional to 641.67, 885.43 and 361.90 is: 499.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.67 : 885.43 = 361.90 : x
  2. Step 2: Convert to fraction form
    641.67/885.43 = 361.90/x
  3. Step 3: Cross multiply
    641.67x = 885.43 × 361.90
  4. Step 4: Simplify right side
    641.67x = 320,437.12
  5. Step 5: Solve for x
    x = 320,437.12/641.67
  6. Step 6: Final answer
    x = 499.38

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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.