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Finding the Fourth Proportional to 641.60, 879.63 and 629.92

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Solution

The fourth proportional to 641.60, 879.63 and 629.92 is: 863.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    641.60 : 879.63 = 629.92 : x
  2. Step 2: Convert to fraction form
    641.60/879.63 = 629.92/x
  3. Step 3: Cross multiply
    641.60x = 879.63 × 629.92
  4. Step 4: Simplify right side
    641.60x = 554,099.99
  5. Step 5: Solve for x
    x = 554,099.99/641.60
  6. Step 6: Final answer
    x = 863.62

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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.