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Finding the Fourth Proportional to 131,171.16, 196,671.96 and 71,990.94

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Solution

The fourth proportional to 131,171.16, 196,671.96 and 71,990.94 is: 107,939.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    131,171.16 : 196,671.96 = 71,990.94 : x
  2. Step 2: Convert to fraction form
    131,171.16/196,671.96 = 71,990.94/x
  3. Step 3: Cross multiply
    131,171.16x = 196,671.96 × 71,990.94
  4. Step 4: Simplify right side
    131,171.16x = 14,158,599,272.04
  5. Step 5: Solve for x
    x = 14,158,599,272.04/131,171.16
  6. Step 6: Final answer
    x = 107,939.88

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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.