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Finding the Fourth Proportional to 3,909.68, 5,865.36 and 1,311.92

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Solution

The fourth proportional to 3,909.68, 5,865.36 and 1,311.92 is: 1,968.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,909.68 : 5,865.36 = 1,311.92 : x
  2. Step 2: Convert to fraction form
    3,909.68/5,865.36 = 1,311.92/x
  3. Step 3: Cross multiply
    3,909.68x = 5,865.36 × 1,311.92
  4. Step 4: Simplify right side
    3,909.68x = 7,694,883.09
  5. Step 5: Solve for x
    x = 7,694,883.09/3,909.68
  6. Step 6: Final answer
    x = 1,968.16

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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.