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Finding the Fourth Proportional to 68,650.40, 102,996.39 and 28,688.78

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Solution

The fourth proportional to 68,650.40, 102,996.39 and 28,688.78 is: 43,041.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,650.40 : 102,996.39 = 28,688.78 : x
  2. Step 2: Convert to fraction form
    68,650.40/102,996.39 = 28,688.78/x
  3. Step 3: Cross multiply
    68,650.40x = 102,996.39 × 28,688.78
  4. Step 4: Simplify right side
    68,650.40x = 2,954,840,773.50
  5. Step 5: Solve for x
    x = 2,954,840,773.50/68,650.40
  6. Step 6: Final answer
    x = 43,041.86

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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.