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Finding the Fourth Proportional to 5,679.92, 8,520.46 and 2,172.88

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Solution

The fourth proportional to 5,679.92, 8,520.46 and 2,172.88 is: 3,259.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,679.92 : 8,520.46 = 2,172.88 : x
  2. Step 2: Convert to fraction form
    5,679.92/8,520.46 = 2,172.88/x
  3. Step 3: Cross multiply
    5,679.92x = 8,520.46 × 2,172.88
  4. Step 4: Simplify right side
    5,679.92x = 18,513,937.12
  5. Step 5: Solve for x
    x = 18,513,937.12/5,679.92
  6. Step 6: Final answer
    x = 3,259.54

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1.5x scale

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.