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Finding the Fourth Proportional to 641.53, 885.33 and 361.71

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Solution

The fourth proportional to 641.53, 885.33 and 361.71 is: 499.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.53 : 885.33 = 361.71 : x
  2. Step 2: Convert to fraction form
    641.53/885.33 = 361.71/x
  3. Step 3: Cross multiply
    641.53x = 885.33 × 361.71
  4. Step 4: Simplify right side
    641.53x = 320,233.20
  5. Step 5: Solve for x
    x = 320,233.20/641.53
  6. Step 6: Final answer
    x = 499.17

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.