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Finding the Fourth Proportional to 72,668.25, 108,989.78 and 20,063.61

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Solution

The fourth proportional to 72,668.25, 108,989.78 and 20,063.61 is: 30,091.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,668.25 : 108,989.78 = 20,063.61 : x
  2. Step 2: Convert to fraction form
    72,668.25/108,989.78 = 20,063.61/x
  3. Step 3: Cross multiply
    72,668.25x = 108,989.78 × 20,063.61
  4. Step 4: Simplify right side
    72,668.25x = 2,186,728,339.59
  5. Step 5: Solve for x
    x = 2,186,728,339.59/72,668.25
  6. Step 6: Final answer
    x = 30,091.94

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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.