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Finding the Fourth Proportional to 18,663.28, 27,981.02 and 8,131.30

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Solution

The fourth proportional to 18,663.28, 27,981.02 and 8,131.30 is: 12,190.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,663.28 : 27,981.02 = 8,131.30 : x
  2. Step 2: Convert to fraction form
    18,663.28/27,981.02 = 8,131.30/x
  3. Step 3: Cross multiply
    18,663.28x = 27,981.02 × 8,131.30
  4. Step 4: Simplify right side
    18,663.28x = 227,522,067.93
  5. Step 5: Solve for x
    x = 227,522,067.93/18,663.28
  6. Step 6: Final answer
    x = 12,190.89

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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.