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Finding the Fourth Proportional to 685.20, 1,027.98 and 295.32

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Solution

The fourth proportional to 685.20, 1,027.98 and 295.32 is: 443.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    685.20 : 1,027.98 = 295.32 : x
  2. Step 2: Convert to fraction form
    685.20/1,027.98 = 295.32/x
  3. Step 3: Cross multiply
    685.20x = 1,027.98 × 295.32
  4. Step 4: Simplify right side
    685.20x = 303,583.05
  5. Step 5: Solve for x
    x = 303,583.05/685.20
  6. Step 6: Final answer
    x = 443.06

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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.