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Finding the Fourth Proportional to 81,912.60, 122,868.90 and 40,440.60

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Solution

The fourth proportional to 81,912.60, 122,868.90 and 40,440.60 is: 60,660.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,912.60 : 122,868.90 = 40,440.60 : x
  2. Step 2: Convert to fraction form
    81,912.60/122,868.90 = 40,440.60/x
  3. Step 3: Cross multiply
    81,912.60x = 122,868.90 × 40,440.60
  4. Step 4: Simplify right side
    81,912.60x = 4,968,892,037.34
  5. Step 5: Solve for x
    x = 4,968,892,037.34/81,912.60
  6. Step 6: Final answer
    x = 60,660.90

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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.