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Finding the Fourth Proportional to 18,126.64, 27,189.96 and 4,979.08

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Solution

The fourth proportional to 18,126.64, 27,189.96 and 4,979.08 is: 7,468.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,126.64 : 27,189.96 = 4,979.08 : x
  2. Step 2: Convert to fraction form
    18,126.64/27,189.96 = 4,979.08/x
  3. Step 3: Cross multiply
    18,126.64x = 27,189.96 × 4,979.08
  4. Step 4: Simplify right side
    18,126.64x = 135,380,986.04
  5. Step 5: Solve for x
    x = 135,380,986.04/18,126.64
  6. Step 6: Final answer
    x = 7,468.62

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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.