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Finding the Fourth Proportional to 3,325.20, 4,987.86 and 859.86

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Solution

The fourth proportional to 3,325.20, 4,987.86 and 859.86 is: 1,289.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,325.20 : 4,987.86 = 859.86 : x
  2. Step 2: Convert to fraction form
    3,325.20/4,987.86 = 859.86/x
  3. Step 3: Cross multiply
    3,325.20x = 4,987.86 × 859.86
  4. Step 4: Simplify right side
    3,325.20x = 4,288,861.30
  5. Step 5: Solve for x
    x = 4,288,861.30/3,325.20
  6. Step 6: Final answer
    x = 1,289.81

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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.