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Finding the Fourth Proportional to 328,081.62, 491,285.70 and 261,618.69

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Solution

The fourth proportional to 328,081.62, 491,285.70 and 261,618.69 is: 391,760.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,081.62 : 491,285.70 = 261,618.69 : x
  2. Step 2: Convert to fraction form
    328,081.62/491,285.70 = 261,618.69/x
  3. Step 3: Cross multiply
    328,081.62x = 491,285.70 × 261,618.69
  4. Step 4: Simplify right side
    328,081.62x = 128,529,521,249.73
  5. Step 5: Solve for x
    x = 128,529,521,249.73/328,081.62
  6. Step 6: Final answer
    x = 391,760.81

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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.