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Finding the Fourth Proportional to 5,245.80, 7,868.72 and 2,125.86

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Solution

The fourth proportional to 5,245.80, 7,868.72 and 2,125.86 is: 3,188.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,245.80 : 7,868.72 = 2,125.86 : x
  2. Step 2: Convert to fraction form
    5,245.80/7,868.72 = 2,125.86/x
  3. Step 3: Cross multiply
    5,245.80x = 7,868.72 × 2,125.86
  4. Step 4: Simplify right side
    5,245.80x = 16,727,786.47
  5. Step 5: Solve for x
    x = 16,727,786.47/5,245.80
  6. Step 6: Final answer
    x = 3,188.80

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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.