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Finding the Fourth Proportional to 79,979.72, 119,717.96 and 54,872.96

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Solution

The fourth proportional to 79,979.72, 119,717.96 and 54,872.96 is: 82,136.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,979.72 : 119,717.96 = 54,872.96 : x
  2. Step 2: Convert to fraction form
    79,979.72/119,717.96 = 54,872.96/x
  3. Step 3: Cross multiply
    79,979.72x = 119,717.96 × 54,872.96
  4. Step 4: Simplify right side
    79,979.72x = 6,569,278,830.36
  5. Step 5: Solve for x
    x = 6,569,278,830.36/79,979.72
  6. Step 6: Final answer
    x = 82,136.81

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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.