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Finding the Fourth Proportional to 5,410.64, 8,109.60 and 2,489.20

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Solution

The fourth proportional to 5,410.64, 8,109.60 and 2,489.20 is: 3,730.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,410.64 : 8,109.60 = 2,489.20 : x
  2. Step 2: Convert to fraction form
    5,410.64/8,109.60 = 2,489.20/x
  3. Step 3: Cross multiply
    5,410.64x = 8,109.60 × 2,489.20
  4. Step 4: Simplify right side
    5,410.64x = 20,186,416.32
  5. Step 5: Solve for x
    x = 20,186,416.32/5,410.64
  6. Step 6: Final answer
    x = 3,730.87

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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.