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Finding the Fourth Proportional to 18,331.80, 27,489.48 and 5,181.08

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Solution

The fourth proportional to 18,331.80, 27,489.48 and 5,181.08 is: 7,769.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,331.80 : 27,489.48 = 5,181.08 : x
  2. Step 2: Convert to fraction form
    18,331.80/27,489.48 = 5,181.08/x
  3. Step 3: Cross multiply
    18,331.80x = 27,489.48 × 5,181.08
  4. Step 4: Simplify right side
    18,331.80x = 142,425,195.04
  5. Step 5: Solve for x
    x = 142,425,195.04/18,331.80
  6. Step 6: Final answer
    x = 7,769.30

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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.