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Finding the Fourth Proportional to 6,986, 10,469.12 and 3,867.40

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Solution

The fourth proportional to 6,986, 10,469.12 and 3,867.40 is: 5,795.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,986 : 10,469.12 = 3,867.40 : x
  2. Step 2: Convert to fraction form
    6,986/10,469.12 = 3,867.40/x
  3. Step 3: Cross multiply
    6,986x = 10,469.12 × 3,867.40
  4. Step 4: Simplify right side
    6,986x = 40,488,274.69
  5. Step 5: Solve for x
    x = 40,488,274.69/6,986
  6. Step 6: Final answer
    x = 5,795.63

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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.