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Finding the Fourth Proportional to 381,859.80, 572,789.70 and 328,205.40

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Solution

The fourth proportional to 381,859.80, 572,789.70 and 328,205.40 is: 492,308.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,859.80 : 572,789.70 = 328,205.40 : x
  2. Step 2: Convert to fraction form
    381,859.80/572,789.70 = 328,205.40/x
  3. Step 3: Cross multiply
    381,859.80x = 572,789.70 × 328,205.40
  4. Step 4: Simplify right side
    381,859.80x = 187,992,672,604.38
  5. Step 5: Solve for x
    x = 187,992,672,604.38/381,859.80
  6. Step 6: Final answer
    x = 492,308.10

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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.