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Finding the Fourth Proportional to 850.32, 1,172.55 and 629.70

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Solution

The fourth proportional to 850.32, 1,172.55 and 629.70 is: 868.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    850.32 : 1,172.55 = 629.70 : x
  2. Step 2: Convert to fraction form
    850.32/1,172.55 = 629.70/x
  3. Step 3: Cross multiply
    850.32x = 1,172.55 × 629.70
  4. Step 4: Simplify right side
    850.32x = 738,354.74
  5. Step 5: Solve for x
    x = 738,354.74/850.32
  6. Step 6: Final answer
    x = 868.33

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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.