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Finding the Fourth Proportional to 982.98, 1,356.62 and 629.23

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Solution

The fourth proportional to 982.98, 1,356.62 and 629.23 is: 868.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    982.98 : 1,356.62 = 629.23 : x
  2. Step 2: Convert to fraction form
    982.98/1,356.62 = 629.23/x
  3. Step 3: Cross multiply
    982.98x = 1,356.62 × 629.23
  4. Step 4: Simplify right side
    982.98x = 853,626.00
  5. Step 5: Solve for x
    x = 853,626.00/982.98
  6. Step 6: Final answer
    x = 868.41

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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.