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Finding the Fourth Proportional to 68,540.31, 102,739.71 and 28,580.73

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Solution

The fourth proportional to 68,540.31, 102,739.71 and 28,580.73 is: 42,841.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,540.31 : 102,739.71 = 28,580.73 : x
  2. Step 2: Convert to fraction form
    68,540.31/102,739.71 = 28,580.73/x
  3. Step 3: Cross multiply
    68,540.31x = 102,739.71 × 28,580.73
  4. Step 4: Simplify right side
    68,540.31x = 2,936,375,911.79
  5. Step 5: Solve for x
    x = 2,936,375,911.79/68,540.31
  6. Step 6: Final answer
    x = 42,841.59

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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.