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Finding the Fourth Proportional to 629.67, 872.62 and 620.86

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Solution

The fourth proportional to 629.67, 872.62 and 620.86 is: 860.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.67 : 872.62 = 620.86 : x
  2. Step 2: Convert to fraction form
    629.67/872.62 = 620.86/x
  3. Step 3: Cross multiply
    629.67x = 872.62 × 620.86
  4. Step 4: Simplify right side
    629.67x = 541,774.85
  5. Step 5: Solve for x
    x = 541,774.85/629.67
  6. Step 6: Final answer
    x = 860.41

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.