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Finding the Fourth Proportional to 81,961.70, 122,942.55 and 80,732.90

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Solution

The fourth proportional to 81,961.70, 122,942.55 and 80,732.90 is: 121,099.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,961.70 : 122,942.55 = 80,732.90 : x
  2. Step 2: Convert to fraction form
    81,961.70/122,942.55 = 80,732.90/x
  3. Step 3: Cross multiply
    81,961.70x = 122,942.55 × 80,732.90
  4. Step 4: Simplify right side
    81,961.70x = 9,925,508,594.90
  5. Step 5: Solve for x
    x = 9,925,508,594.90/81,961.70
  6. Step 6: Final answer
    x = 121,099.35

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1.5x scale

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.