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Finding the Fourth Proportional to 812.56, 1,217.22 and 629.32

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Solution

The fourth proportional to 812.56, 1,217.22 and 629.32 is: 942.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    812.56 : 1,217.22 = 629.32 : x
  2. Step 2: Convert to fraction form
    812.56/1,217.22 = 629.32/x
  3. Step 3: Cross multiply
    812.56x = 1,217.22 × 629.32
  4. Step 4: Simplify right side
    812.56x = 766,020.89
  5. Step 5: Solve for x
    x = 766,020.89/812.56
  6. Step 6: Final answer
    x = 942.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.