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Finding the Fourth Proportional to 263,310.12, 395,006.28 and 85,775.88

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Solution

The fourth proportional to 263,310.12, 395,006.28 and 85,775.88 is: 128,677.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,310.12 : 395,006.28 = 85,775.88 : x
  2. Step 2: Convert to fraction form
    263,310.12/395,006.28 = 85,775.88/x
  3. Step 3: Cross multiply
    263,310.12x = 395,006.28 × 85,775.88
  4. Step 4: Simplify right side
    263,310.12x = 33,882,011,272.53
  5. Step 5: Solve for x
    x = 33,882,011,272.53/263,310.12
  6. Step 6: Final answer
    x = 128,677.21

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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.