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Finding the Fourth Proportional to 18,662.76, 27,989.82 and 11,979.09

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Solution

The fourth proportional to 18,662.76, 27,989.82 and 11,979.09 is: 17,965.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,662.76 : 27,989.82 = 11,979.09 : x
  2. Step 2: Convert to fraction form
    18,662.76/27,989.82 = 11,979.09/x
  3. Step 3: Cross multiply
    18,662.76x = 27,989.82 × 11,979.09
  4. Step 4: Simplify right side
    18,662.76x = 335,292,572.86
  5. Step 5: Solve for x
    x = 335,292,572.86/18,662.76
  6. Step 6: Final answer
    x = 17,965.86

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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.