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Finding the Fourth Proportional to 685.12, 1,027.66 and 252.28

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Solution

The fourth proportional to 685.12, 1,027.66 and 252.28 is: 378.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.12 : 1,027.66 = 252.28 : x
  2. Step 2: Convert to fraction form
    685.12/1,027.66 = 252.28/x
  3. Step 3: Cross multiply
    685.12x = 1,027.66 × 252.28
  4. Step 4: Simplify right side
    685.12x = 259,258.06
  5. Step 5: Solve for x
    x = 259,258.06/685.12
  6. Step 6: Final answer
    x = 378.41

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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.