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Finding the Fourth Proportional to 6,489.76, 9,735.52 and 2,105.80

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Solution

The fourth proportional to 6,489.76, 9,735.52 and 2,105.80 is: 3,158.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,489.76 : 9,735.52 = 2,105.80 : x
  2. Step 2: Convert to fraction form
    6,489.76/9,735.52 = 2,105.80/x
  3. Step 3: Cross multiply
    6,489.76x = 9,735.52 × 2,105.80
  4. Step 4: Simplify right side
    6,489.76x = 20,501,058.02
  5. Step 5: Solve for x
    x = 20,501,058.02/6,489.76
  6. Step 6: Final answer
    x = 3,158.99

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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.