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Finding the Fourth Proportional to 2,144.96, 3,217.30 and 685.16

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Solution

The fourth proportional to 2,144.96, 3,217.30 and 685.16 is: 1,027.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,144.96 : 3,217.30 = 685.16 : x
  2. Step 2: Convert to fraction form
    2,144.96/3,217.30 = 685.16/x
  3. Step 3: Cross multiply
    2,144.96x = 3,217.30 × 685.16
  4. Step 4: Simplify right side
    2,144.96x = 2,204,365.27
  5. Step 5: Solve for x
    x = 2,204,365.27/2,144.96
  6. Step 6: Final answer
    x = 1,027.70

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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.