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Finding the Fourth Proportional to 684.97, 1,028.07 and 641.23

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Solution

The fourth proportional to 684.97, 1,028.07 and 641.23 is: 962.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.97 : 1,028.07 = 641.23 : x
  2. Step 2: Convert to fraction form
    684.97/1,028.07 = 641.23/x
  3. Step 3: Cross multiply
    684.97x = 1,028.07 × 641.23
  4. Step 4: Simplify right side
    684.97x = 659,229.33
  5. Step 5: Solve for x
    x = 659,229.33/684.97
  6. Step 6: Final answer
    x = 962.42

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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.