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Finding the Fourth Proportional to 3,659.70, 5,485.10 and 2,487.90

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Solution

The fourth proportional to 3,659.70, 5,485.10 and 2,487.90 is: 3,728.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,659.70 : 5,485.10 = 2,487.90 : x
  2. Step 2: Convert to fraction form
    3,659.70/5,485.10 = 2,487.90/x
  3. Step 3: Cross multiply
    3,659.70x = 5,485.10 × 2,487.90
  4. Step 4: Simplify right side
    3,659.70x = 13,646,367.85
  5. Step 5: Solve for x
    x = 13,646,367.85/3,659.70
  6. Step 6: Final answer
    x = 3,728.82

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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.