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Finding the Fourth Proportional to 83,879.70, 125,819.55 and 79,991.70

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Solution

The fourth proportional to 83,879.70, 125,819.55 and 79,991.70 is: 119,987.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    83,879.70 : 125,819.55 = 79,991.70 : x
  2. Step 2: Convert to fraction form
    83,879.70/125,819.55 = 79,991.70/x
  3. Step 3: Cross multiply
    83,879.70x = 125,819.55 × 79,991.70
  4. Step 4: Simplify right side
    83,879.70x = 10,064,519,697.74
  5. Step 5: Solve for x
    x = 10,064,519,697.74/83,879.70
  6. Step 6: Final answer
    x = 119,987.55

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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.