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Finding the Fourth Proportional to 381,612.80, 571,929.60 and 213,132.80

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Solution

The fourth proportional to 381,612.80, 571,929.60 and 213,132.80 is: 319,425.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    381,612.80 : 571,929.60 = 213,132.80 : x
  2. Step 2: Convert to fraction form
    381,612.80/571,929.60 = 213,132.80/x
  3. Step 3: Cross multiply
    381,612.80x = 571,929.60 × 213,132.80
  4. Step 4: Simplify right side
    381,612.80x = 121,896,957,050.88
  5. Step 5: Solve for x
    x = 121,896,957,050.88/381,612.80
  6. Step 6: Final answer
    x = 319,425.76

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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.