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Finding the Fourth Proportional to 81,011.70, 121,481.10 and 36,615.60

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Solution

The fourth proportional to 81,011.70, 121,481.10 and 36,615.60 is: 54,906.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,011.70 : 121,481.10 = 36,615.60 : x
  2. Step 2: Convert to fraction form
    81,011.70/121,481.10 = 36,615.60/x
  3. Step 3: Cross multiply
    81,011.70x = 121,481.10 × 36,615.60
  4. Step 4: Simplify right side
    81,011.70x = 4,448,103,365.16
  5. Step 5: Solve for x
    x = 4,448,103,365.16/81,011.70
  6. Step 6: Final answer
    x = 54,906.93

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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.