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Finding the Fourth Proportional to 13,713.31, 18,930.94 and 8,679.97

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Solution

The fourth proportional to 13,713.31, 18,930.94 and 8,679.97 is: 11,982.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,713.31 : 18,930.94 = 8,679.97 : x
  2. Step 2: Convert to fraction form
    13,713.31/18,930.94 = 8,679.97/x
  3. Step 3: Cross multiply
    13,713.31x = 18,930.94 × 8,679.97
  4. Step 4: Simplify right side
    13,713.31x = 164,319,991.27
  5. Step 5: Solve for x
    x = 164,319,991.27/13,713.31
  6. Step 6: Final answer
    x = 11,982.52

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1.5x scale

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.