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Finding the Fourth Proportional to 639.13, 881.99 and 359.41

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Solution

The fourth proportional to 639.13, 881.99 and 359.41 is: 495.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.13 : 881.99 = 359.41 : x
  2. Step 2: Convert to fraction form
    639.13/881.99 = 359.41/x
  3. Step 3: Cross multiply
    639.13x = 881.99 × 359.41
  4. Step 4: Simplify right side
    639.13x = 316,992.02
  5. Step 5: Solve for x
    x = 316,992.02/639.13
  6. Step 6: Final answer
    x = 495.98

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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.