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Finding the Fourth Proportional to 268,421.20, 402,286.20 and 205,781.20

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Solution

The fourth proportional to 268,421.20, 402,286.20 and 205,781.20 is: 308,406.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    268,421.20 : 402,286.20 = 205,781.20 : x
  2. Step 2: Convert to fraction form
    268,421.20/402,286.20 = 205,781.20/x
  3. Step 3: Cross multiply
    268,421.20x = 402,286.20 × 205,781.20
  4. Step 4: Simplify right side
    268,421.20x = 82,782,936,979.44
  5. Step 5: Solve for x
    x = 82,782,936,979.44/268,421.20
  6. Step 6: Final answer
    x = 308,406.85

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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.