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Finding the Fourth Proportional to 639.14, 881.34 and 450.28

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Solution

The fourth proportional to 639.14, 881.34 and 450.28 is: 620.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.14 : 881.34 = 450.28 : x
  2. Step 2: Convert to fraction form
    639.14/881.34 = 450.28/x
  3. Step 3: Cross multiply
    639.14x = 881.34 × 450.28
  4. Step 4: Simplify right side
    639.14x = 396,847.52
  5. Step 5: Solve for x
    x = 396,847.52/639.14
  6. Step 6: Final answer
    x = 620.91

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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.