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Finding the Fourth Proportional to 685.98, 1,029.21 and 223.76

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Solution

The fourth proportional to 685.98, 1,029.21 and 223.76 is: 335.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.98 : 1,029.21 = 223.76 : x
  2. Step 2: Convert to fraction form
    685.98/1,029.21 = 223.76/x
  3. Step 3: Cross multiply
    685.98x = 1,029.21 × 223.76
  4. Step 4: Simplify right side
    685.98x = 230,290.88
  5. Step 5: Solve for x
    x = 230,290.88/685.98
  6. Step 6: Final answer
    x = 335.71

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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.