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Finding the Fourth Proportional to 143,912.10, 215,576.55 and 81,509.70

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Solution

The fourth proportional to 143,912.10, 215,576.55 and 81,509.70 is: 122,099.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,912.10 : 215,576.55 = 81,509.70 : x
  2. Step 2: Convert to fraction form
    143,912.10/215,576.55 = 81,509.70/x
  3. Step 3: Cross multiply
    143,912.10x = 215,576.55 × 81,509.70
  4. Step 4: Simplify right side
    143,912.10x = 17,571,579,917.54
  5. Step 5: Solve for x
    x = 17,571,579,917.54/143,912.10
  6. Step 6: Final answer
    x = 122,099.39

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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.