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Finding the Fourth Proportional to 128,081.70, 191,903.85 and 81,279.90

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Solution

The fourth proportional to 128,081.70, 191,903.85 and 81,279.90 is: 121,781.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,081.70 : 191,903.85 = 81,279.90 : x
  2. Step 2: Convert to fraction form
    128,081.70/191,903.85 = 81,279.90/x
  3. Step 3: Cross multiply
    128,081.70x = 191,903.85 × 81,279.90
  4. Step 4: Simplify right side
    128,081.70x = 15,597,925,737.62
  5. Step 5: Solve for x
    x = 15,597,925,737.62/128,081.70
  6. Step 6: Final answer
    x = 121,781.06

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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.