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Finding the Fourth Proportional to 639.18, 881.98 and 359.37

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Solution

The fourth proportional to 639.18, 881.98 and 359.37 is: 495.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.18 : 881.98 = 359.37 : x
  2. Step 2: Convert to fraction form
    639.18/881.98 = 359.37/x
  3. Step 3: Cross multiply
    639.18x = 881.98 × 359.37
  4. Step 4: Simplify right side
    639.18x = 316,957.15
  5. Step 5: Solve for x
    x = 316,957.15/639.18
  6. Step 6: Final answer
    x = 495.88

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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.