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Finding the Fourth Proportional to 79,939.68, 119,908.98 and 20,775.12

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Solution

The fourth proportional to 79,939.68, 119,908.98 and 20,775.12 is: 31,162.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,939.68 : 119,908.98 = 20,775.12 : x
  2. Step 2: Convert to fraction form
    79,939.68/119,908.98 = 20,775.12/x
  3. Step 3: Cross multiply
    79,939.68x = 119,908.98 × 20,775.12
  4. Step 4: Simplify right side
    79,939.68x = 2,491,123,448.58
  5. Step 5: Solve for x
    x = 2,491,123,448.58/79,939.68
  6. Step 6: Final answer
    x = 31,162.54

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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.