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Finding the Fourth Proportional to 8,679.17, 13,016.09 and 3,131.82

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Solution

The fourth proportional to 8,679.17, 13,016.09 and 3,131.82 is: 4,696.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,679.17 : 13,016.09 = 3,131.82 : x
  2. Step 2: Convert to fraction form
    8,679.17/13,016.09 = 3,131.82/x
  3. Step 3: Cross multiply
    8,679.17x = 13,016.09 × 3,131.82
  4. Step 4: Simplify right side
    8,679.17x = 40,764,058.81
  5. Step 5: Solve for x
    x = 40,764,058.81/8,679.17
  6. Step 6: Final answer
    x = 4,696.77

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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.