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Finding the Fourth Proportional to 664,872, 917,589.76 and 396,600

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Solution

The fourth proportional to 664,872, 917,589.76 and 396,600 is: 547,347.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,872 : 917,589.76 = 396,600 : x
  2. Step 2: Convert to fraction form
    664,872/917,589.76 = 396,600/x
  3. Step 3: Cross multiply
    664,872x = 917,589.76 × 396,600
  4. Step 4: Simplify right side
    664,872x = 363,916,098,816
  5. Step 5: Solve for x
    x = 363,916,098,816/664,872
  6. Step 6: Final answer
    x = 547,347.61

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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.