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Finding the Fourth Proportional to 72,661.20, 108,918.90 and 33,246.60

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Solution

The fourth proportional to 72,661.20, 108,918.90 and 33,246.60 is: 49,836.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,661.20 : 108,918.90 = 33,246.60 : x
  2. Step 2: Convert to fraction form
    72,661.20/108,918.90 = 33,246.60/x
  3. Step 3: Cross multiply
    72,661.20x = 108,918.90 × 33,246.60
  4. Step 4: Simplify right side
    72,661.20x = 3,621,183,100.74
  5. Step 5: Solve for x
    x = 3,621,183,100.74/72,661.20
  6. Step 6: Final answer
    x = 49,836.54

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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.