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Finding the Fourth Proportional to 72,671.34, 109,005.92 and 20,079.66

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Solution

The fourth proportional to 72,671.34, 109,005.92 and 20,079.66 is: 30,119.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,671.34 : 109,005.92 = 20,079.66 : x
  2. Step 2: Convert to fraction form
    72,671.34/109,005.92 = 20,079.66/x
  3. Step 3: Cross multiply
    72,671.34x = 109,005.92 × 20,079.66
  4. Step 4: Simplify right side
    72,671.34x = 2,188,801,811.59
  5. Step 5: Solve for x
    x = 2,188,801,811.59/72,671.34
  6. Step 6: Final answer
    x = 30,119.19

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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.