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Finding the Fourth Proportional to 18,129.28, 27,179.76 and 12,212.80

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Solution

The fourth proportional to 18,129.28, 27,179.76 and 12,212.80 is: 18,309.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,129.28 : 27,179.76 = 12,212.80 : x
  2. Step 2: Convert to fraction form
    18,129.28/27,179.76 = 12,212.80/x
  3. Step 3: Cross multiply
    18,129.28x = 27,179.76 × 12,212.80
  4. Step 4: Simplify right side
    18,129.28x = 331,940,972.93
  5. Step 5: Solve for x
    x = 331,940,972.93/18,129.28
  6. Step 6: Final answer
    x = 18,309.66

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1.5x scale

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.