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Finding the Fourth Proportional to 639.32, 882.20 and 359.50

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Solution

The fourth proportional to 639.32, 882.20 and 359.50 is: 496.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.32 : 882.20 = 359.50 : x
  2. Step 2: Convert to fraction form
    639.32/882.20 = 359.50/x
  3. Step 3: Cross multiply
    639.32x = 882.20 × 359.50
  4. Step 4: Simplify right side
    639.32x = 317,146.49
  5. Step 5: Solve for x
    x = 317,146.49/639.32
  6. Step 6: Final answer
    x = 496.07

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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.