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Finding the Fourth Proportional to 13,489.56, 18,615.18 and 8,456.49

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Solution

The fourth proportional to 13,489.56, 18,615.18 and 8,456.49 is: 11,669.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,489.56 : 18,615.18 = 8,456.49 : x
  2. Step 2: Convert to fraction form
    13,489.56/18,615.18 = 8,456.49/x
  3. Step 3: Cross multiply
    13,489.56x = 18,615.18 × 8,456.49
  4. Step 4: Simplify right side
    13,489.56x = 157,419,083.52
  5. Step 5: Solve for x
    x = 157,419,083.52/13,489.56
  6. Step 6: Final answer
    x = 11,669.70

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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.