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Finding the Fourth Proportional to 260,910.72, 391,421.95 and 80,992.19

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Solution

The fourth proportional to 260,910.72, 391,421.95 and 80,992.19 is: 121,505.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,910.72 : 391,421.95 = 80,992.19 : x
  2. Step 2: Convert to fraction form
    260,910.72/391,421.95 = 80,992.19/x
  3. Step 3: Cross multiply
    260,910.72x = 391,421.95 × 80,992.19
  4. Step 4: Simplify right side
    260,910.72x = 31,702,121,720.64
  5. Step 5: Solve for x
    x = 31,702,121,720.64/260,910.72
  6. Step 6: Final answer
    x = 121,505.63

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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.