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Finding the Fourth Proportional to 639.99, 959.03 and 331.43

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Solution

The fourth proportional to 639.99, 959.03 and 331.43 is: 496.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.99 : 959.03 = 331.43 : x
  2. Step 2: Convert to fraction form
    639.99/959.03 = 331.43/x
  3. Step 3: Cross multiply
    639.99x = 959.03 × 331.43
  4. Step 4: Simplify right side
    639.99x = 317,851.31
  5. Step 5: Solve for x
    x = 317,851.31/639.99
  6. Step 6: Final answer
    x = 496.65

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.