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Finding the Fourth Proportional to 200,703.20, 300,979.78 and 80,719.65

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Solution

The fourth proportional to 200,703.20, 300,979.78 and 80,719.65 is: 121,049.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    200,703.20 : 300,979.78 = 80,719.65 : x
  2. Step 2: Convert to fraction form
    200,703.20/300,979.78 = 80,719.65/x
  3. Step 3: Cross multiply
    200,703.20x = 300,979.78 × 80,719.65
  4. Step 4: Simplify right side
    200,703.20x = 24,294,981,948.03
  5. Step 5: Solve for x
    x = 24,294,981,948.03/200,703.20
  6. Step 6: Final answer
    x = 121,049.30

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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.