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Finding the Fourth Proportional to 28,905.81, 43,358.73 and 8,129.31

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Solution

The fourth proportional to 28,905.81, 43,358.73 and 8,129.31 is: 12,193.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,905.81 : 43,358.73 = 8,129.31 : x
  2. Step 2: Convert to fraction form
    28,905.81/43,358.73 = 8,129.31/x
  3. Step 3: Cross multiply
    28,905.81x = 43,358.73 × 8,129.31
  4. Step 4: Simplify right side
    28,905.81x = 352,476,557.38
  5. Step 5: Solve for x
    x = 352,476,557.38/28,905.81
  6. Step 6: Final answer
    x = 12,193.97

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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.