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Finding the Fourth Proportional to 639.31, 882.26 and 359.56

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Solution

The fourth proportional to 639.31, 882.26 and 359.56 is: 496.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.31 : 882.26 = 359.56 : x
  2. Step 2: Convert to fraction form
    639.31/882.26 = 359.56/x
  3. Step 3: Cross multiply
    639.31x = 882.26 × 359.56
  4. Step 4: Simplify right side
    639.31x = 317,225.41
  5. Step 5: Solve for x
    x = 317,225.41/639.31
  6. Step 6: Final answer
    x = 496.20

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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.