Home / 5,286.90-7,930.35-1,391.25

Finding the Fourth Proportional to 5,286.90, 7,930.35 and 1,391.25

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Solution

The fourth proportional to 5,286.90, 7,930.35 and 1,391.25 is: 2,086.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,286.90 : 7,930.35 = 1,391.25 : x
  2. Step 2: Convert to fraction form
    5,286.90/7,930.35 = 1,391.25/x
  3. Step 3: Cross multiply
    5,286.90x = 7,930.35 × 1,391.25
  4. Step 4: Simplify right side
    5,286.90x = 11,033,099.44
  5. Step 5: Solve for x
    x = 11,033,099.44/5,286.90
  6. Step 6: Final answer
    x = 2,086.88

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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.