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Finding the Fourth Proportional to 850.35, 1,172.01 and 629.85

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Solution

The fourth proportional to 850.35, 1,172.01 and 629.85 is: 868.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.35 : 1,172.01 = 629.85 : x
  2. Step 2: Convert to fraction form
    850.35/1,172.01 = 629.85/x
  3. Step 3: Cross multiply
    850.35x = 1,172.01 × 629.85
  4. Step 4: Simplify right side
    850.35x = 738,190.50
  5. Step 5: Solve for x
    x = 738,190.50/850.35
  6. Step 6: Final answer
    x = 868.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.