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Finding the Fourth Proportional to 685.34, 1,028.03 and 268.85

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Solution

The fourth proportional to 685.34, 1,028.03 and 268.85 is: 403.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.34 : 1,028.03 = 268.85 : x
  2. Step 2: Convert to fraction form
    685.34/1,028.03 = 268.85/x
  3. Step 3: Cross multiply
    685.34x = 1,028.03 × 268.85
  4. Step 4: Simplify right side
    685.34x = 276,384.52
  5. Step 5: Solve for x
    x = 276,384.52/685.34
  6. Step 6: Final answer
    x = 403.28

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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.