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Finding the Fourth Proportional to 386,979, 579,781 and 330,243.36

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Solution

The fourth proportional to 386,979, 579,781 and 330,243.36 is: 494,778.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,979 : 579,781 = 330,243.36 : x
  2. Step 2: Convert to fraction form
    386,979/579,781 = 330,243.36/x
  3. Step 3: Cross multiply
    386,979x = 579,781 × 330,243.36
  4. Step 4: Simplify right side
    386,979x = 191,468,825,504.16
  5. Step 5: Solve for x
    x = 191,468,825,504.16/386,979
  6. Step 6: Final answer
    x = 494,778.34

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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.