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Finding the Fourth Proportional to 81,516.60, 122,274.90 and 68,394.60

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Solution

The fourth proportional to 81,516.60, 122,274.90 and 68,394.60 is: 102,591.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,516.60 : 122,274.90 = 68,394.60 : x
  2. Step 2: Convert to fraction form
    81,516.60/122,274.90 = 68,394.60/x
  3. Step 3: Cross multiply
    81,516.60x = 122,274.90 × 68,394.60
  4. Step 4: Simplify right side
    81,516.60x = 8,362,942,875.54
  5. Step 5: Solve for x
    x = 8,362,942,875.54/81,516.60
  6. Step 6: Final answer
    x = 102,591.90

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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.