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Finding the Fourth Proportional to 81,231.52, 121,857.36 and 28,630.48

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Solution

The fourth proportional to 81,231.52, 121,857.36 and 28,630.48 is: 42,949.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,231.52 : 121,857.36 = 28,630.48 : x
  2. Step 2: Convert to fraction form
    81,231.52/121,857.36 = 28,630.48/x
  3. Step 3: Cross multiply
    81,231.52x = 121,857.36 × 28,630.48
  4. Step 4: Simplify right side
    81,231.52x = 3,488,834,708.33
  5. Step 5: Solve for x
    x = 3,488,834,708.33/81,231.52
  6. Step 6: Final answer
    x = 42,949.27

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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.