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Finding the Fourth Proportional to 81,302.70, 121,917.60 and 36,906.60

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Solution

The fourth proportional to 81,302.70, 121,917.60 and 36,906.60 is: 55,343.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,302.70 : 121,917.60 = 36,906.60 : x
  2. Step 2: Convert to fraction form
    81,302.70/121,917.60 = 36,906.60/x
  3. Step 3: Cross multiply
    81,302.70x = 121,917.60 × 36,906.60
  4. Step 4: Simplify right side
    81,302.70x = 4,499,564,096.16
  5. Step 5: Solve for x
    x = 4,499,564,096.16/81,302.70
  6. Step 6: Final answer
    x = 55,343.35

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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.