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Finding the Fourth Proportional to 629.42, 872.27 and 620.61

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Solution

The fourth proportional to 629.42, 872.27 and 620.61 is: 860.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    629.42 : 872.27 = 620.61 : x
  2. Step 2: Convert to fraction form
    629.42/872.27 = 620.61/x
  3. Step 3: Cross multiply
    629.42x = 872.27 × 620.61
  4. Step 4: Simplify right side
    629.42x = 541,341.04
  5. Step 5: Solve for x
    x = 541,341.04/629.42
  6. Step 6: Final answer
    x = 860.06

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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.