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Finding the Fourth Proportional to 386,464.40, 579,005.40 and 327,021.20

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Solution

The fourth proportional to 386,464.40, 579,005.40 and 327,021.20 is: 489,946.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    386,464.40 : 579,005.40 = 327,021.20 : x
  2. Step 2: Convert to fraction form
    386,464.40/579,005.40 = 327,021.20/x
  3. Step 3: Cross multiply
    386,464.40x = 579,005.40 × 327,021.20
  4. Step 4: Simplify right side
    386,464.40x = 189,347,040,714.48
  5. Step 5: Solve for x
    x = 189,347,040,714.48/386,464.40
  6. Step 6: Final answer
    x = 489,946.92

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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.