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Finding the Fourth Proportional to 721,982, 996,351.28 and 395,326

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Solution

The fourth proportional to 721,982, 996,351.28 and 395,326 is: 545,558.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,982 : 996,351.28 = 395,326 : x
  2. Step 2: Convert to fraction form
    721,982/996,351.28 = 395,326/x
  3. Step 3: Cross multiply
    721,982x = 996,351.28 × 395,326
  4. Step 4: Simplify right side
    721,982x = 393,883,566,117.28
  5. Step 5: Solve for x
    x = 393,883,566,117.28/721,982
  6. Step 6: Final answer
    x = 545,558.71

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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.