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Finding the Fourth Proportional to 3,976.79, 5,489.78 and 2,485.67

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Solution

The fourth proportional to 3,976.79, 5,489.78 and 2,485.67 is: 3,431.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,976.79 : 5,489.78 = 2,485.67 : x
  2. Step 2: Convert to fraction form
    3,976.79/5,489.78 = 2,485.67/x
  3. Step 3: Cross multiply
    3,976.79x = 5,489.78 × 2,485.67
  4. Step 4: Simplify right side
    3,976.79x = 13,645,741.58
  5. Step 5: Solve for x
    x = 13,645,741.58/3,976.79
  6. Step 6: Final answer
    x = 3,431.35

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.