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Finding the Fourth Proportional to 3,871.56, 5,342.78 and 2,103.18

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Solution

The fourth proportional to 3,871.56, 5,342.78 and 2,103.18 is: 2,902.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,871.56 : 5,342.78 = 2,103.18 : x
  2. Step 2: Convert to fraction form
    3,871.56/5,342.78 = 2,103.18/x
  3. Step 3: Cross multiply
    3,871.56x = 5,342.78 × 2,103.18
  4. Step 4: Simplify right side
    3,871.56x = 11,236,817.52
  5. Step 5: Solve for x
    x = 11,236,817.52/3,871.56
  6. Step 6: Final answer
    x = 2,902.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.