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Finding the Fourth Proportional to 85,912.38, 128,790.81 and 30,495.42

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Solution

The fourth proportional to 85,912.38, 128,790.81 and 30,495.42 is: 45,715.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,912.38 : 128,790.81 = 30,495.42 : x
  2. Step 2: Convert to fraction form
    85,912.38/128,790.81 = 30,495.42/x
  3. Step 3: Cross multiply
    85,912.38x = 128,790.81 × 30,495.42
  4. Step 4: Simplify right side
    85,912.38x = 3,927,529,843.09
  5. Step 5: Solve for x
    x = 3,927,529,843.09/85,912.38
  6. Step 6: Final answer
    x = 45,715.53

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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.