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Finding the Fourth Proportional to 644,489.75, 966,728.46 and 391,839.99

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Solution

The fourth proportional to 644,489.75, 966,728.46 and 391,839.99 is: 587,756.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,489.75 : 966,728.46 = 391,839.99 : x
  2. Step 2: Convert to fraction form
    644,489.75/966,728.46 = 391,839.99/x
  3. Step 3: Cross multiply
    644,489.75x = 966,728.46 × 391,839.99
  4. Step 4: Simplify right side
    644,489.75x = 378,802,870,099.12
  5. Step 5: Solve for x
    x = 378,802,870,099.12/644,489.75
  6. Step 6: Final answer
    x = 587,756.24

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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.