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Finding the Fourth Proportional to 321,930.81, 482,905.35 and 85,273.52

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Solution

The fourth proportional to 321,930.81, 482,905.35 and 85,273.52 is: 127,912.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    321,930.81 : 482,905.35 = 85,273.52 : x
  2. Step 2: Convert to fraction form
    321,930.81/482,905.35 = 85,273.52/x
  3. Step 3: Cross multiply
    321,930.81x = 482,905.35 × 85,273.52
  4. Step 4: Simplify right side
    321,930.81x = 41,179,036,606.81
  5. Step 5: Solve for x
    x = 41,179,036,606.81/321,930.81
  6. Step 6: Final answer
    x = 127,912.69

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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.