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Finding the Fourth Proportional to 629.48, 872.37 and 620.67

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Solution

The fourth proportional to 629.48, 872.37 and 620.67 is: 860.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.48 : 872.37 = 620.67 : x
  2. Step 2: Convert to fraction form
    629.48/872.37 = 620.67/x
  3. Step 3: Cross multiply
    629.48x = 872.37 × 620.67
  4. Step 4: Simplify right side
    629.48x = 541,452.97
  5. Step 5: Solve for x
    x = 541,452.97/629.48
  6. Step 6: Final answer
    x = 860.16

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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.