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Finding the Fourth Proportional to 85,940.62, 128,917.05 and 36,013.43

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Solution

The fourth proportional to 85,940.62, 128,917.05 and 36,013.43 is: 54,022.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,940.62 : 128,917.05 = 36,013.43 : x
  2. Step 2: Convert to fraction form
    85,940.62/128,917.05 = 36,013.43/x
  3. Step 3: Cross multiply
    85,940.62x = 128,917.05 × 36,013.43
  4. Step 4: Simplify right side
    85,940.62x = 4,642,745,155.98
  5. Step 5: Solve for x
    x = 4,642,745,155.98/85,940.62
  6. Step 6: Final answer
    x = 54,022.71

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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.