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Finding the Fourth Proportional to 18,129.70, 27,191.49 and 4,979.02

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Solution

The fourth proportional to 18,129.70, 27,191.49 and 4,979.02 is: 7,467.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,129.70 : 27,191.49 = 4,979.02 : x
  2. Step 2: Convert to fraction form
    18,129.70/27,191.49 = 4,979.02/x
  3. Step 3: Cross multiply
    18,129.70x = 27,191.49 × 4,979.02
  4. Step 4: Simplify right side
    18,129.70x = 135,386,972.54
  5. Step 5: Solve for x
    x = 135,386,972.54/18,129.70
  6. Step 6: Final answer
    x = 7,467.69

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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.