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Finding the Fourth Proportional to 722,099.70, 996,528.72 and 399,809.78

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Solution

The fourth proportional to 722,099.70, 996,528.72 and 399,809.78 is: 551,754.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    722,099.70 : 996,528.72 = 399,809.78 : x
  2. Step 2: Convert to fraction form
    722,099.70/996,528.72 = 399,809.78/x
  3. Step 3: Cross multiply
    722,099.70x = 996,528.72 × 399,809.78
  4. Step 4: Simplify right side
    722,099.70x = 398,421,928,306.88
  5. Step 5: Solve for x
    x = 398,421,928,306.88/722,099.70
  6. Step 6: Final answer
    x = 551,754.73

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.