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Finding the Fourth Proportional to 85,990.60, 128,942.70 and 39,190.60

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Solution

The fourth proportional to 85,990.60, 128,942.70 and 39,190.60 is: 58,766.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,990.60 : 128,942.70 = 39,190.60 : x
  2. Step 2: Convert to fraction form
    85,990.60/128,942.70 = 39,190.60/x
  3. Step 3: Cross multiply
    85,990.60x = 128,942.70 × 39,190.60
  4. Step 4: Simplify right side
    85,990.60x = 5,053,341,778.62
  5. Step 5: Solve for x
    x = 5,053,341,778.62/85,990.60
  6. Step 6: Final answer
    x = 58,766.21

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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.