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Finding the Fourth Proportional to 650.96, 892.49 and 639.30

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Solution

The fourth proportional to 650.96, 892.49 and 639.30 is: 876.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    650.96 : 892.49 = 639.30 : x
  2. Step 2: Convert to fraction form
    650.96/892.49 = 639.30/x
  3. Step 3: Cross multiply
    650.96x = 892.49 × 639.30
  4. Step 4: Simplify right side
    650.96x = 570,568.86
  5. Step 5: Solve for x
    x = 570,568.86/650.96
  6. Step 6: Final answer
    x = 876.50

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.