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Finding the Fourth Proportional to 140,908.60, 211,550.55 and 81,786.70

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Solution

The fourth proportional to 140,908.60, 211,550.55 and 81,786.70 is: 122,788.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    140,908.60 : 211,550.55 = 81,786.70 : x
  2. Step 2: Convert to fraction form
    140,908.60/211,550.55 = 81,786.70/x
  3. Step 3: Cross multiply
    140,908.60x = 211,550.55 × 81,786.70
  4. Step 4: Simplify right side
    140,908.60x = 17,302,021,367.69
  5. Step 5: Solve for x
    x = 17,302,021,367.69/140,908.60
  6. Step 6: Final answer
    x = 122,788.97

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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.