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Finding the Fourth Proportional to 260,857.87, 391,342.91 and 80,939.69

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Solution

The fourth proportional to 260,857.87, 391,342.91 and 80,939.69 is: 121,426.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,857.87 : 391,342.91 = 80,939.69 : x
  2. Step 2: Convert to fraction form
    260,857.87/391,342.91 = 80,939.69/x
  3. Step 3: Cross multiply
    260,857.87x = 391,342.91 × 80,939.69
  4. Step 4: Simplify right side
    260,857.87x = 31,675,173,819.10
  5. Step 5: Solve for x
    x = 31,675,173,819.10/260,857.87
  6. Step 6: Final answer
    x = 121,426.94

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1.5x scale

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.