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Finding the Fourth Proportional to 13,141.10, 18,121.01 and 8,659.17

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Solution

The fourth proportional to 13,141.10, 18,121.01 and 8,659.17 is: 11,940.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,141.10 : 18,121.01 = 8,659.17 : x
  2. Step 2: Convert to fraction form
    13,141.10/18,121.01 = 8,659.17/x
  3. Step 3: Cross multiply
    13,141.10x = 18,121.01 × 8,659.17
  4. Step 4: Simplify right side
    13,141.10x = 156,912,862.87
  5. Step 5: Solve for x
    x = 156,912,862.87/13,141.10
  6. Step 6: Final answer
    x = 11,940.62

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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.