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Finding the Fourth Proportional to 722,021.92, 996,357.76 and 399,709.28

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Solution

The fourth proportional to 722,021.92, 996,357.76 and 399,709.28 is: 551,580.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    722,021.92 : 996,357.76 = 399,709.28 : x
  2. Step 2: Convert to fraction form
    722,021.92/996,357.76 = 399,709.28/x
  3. Step 3: Cross multiply
    722,021.92x = 996,357.76 × 399,709.28
  4. Step 4: Simplify right side
    722,021.92x = 398,253,442,872.01
  5. Step 5: Solve for x
    x = 398,253,442,872.01/722,021.92
  6. Step 6: Final answer
    x = 551,580.82

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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.