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Finding the Fourth Proportional to 685.42, 1,028.20 and 252.46

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Solution

The fourth proportional to 685.42, 1,028.20 and 252.46 is: 378.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.42 : 1,028.20 = 252.46 : x
  2. Step 2: Convert to fraction form
    685.42/1,028.20 = 252.46/x
  3. Step 3: Cross multiply
    685.42x = 1,028.20 × 252.46
  4. Step 4: Simplify right side
    685.42x = 259,579.37
  5. Step 5: Solve for x
    x = 259,579.37/685.42
  6. Step 6: Final answer
    x = 378.72

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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.