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Finding the Fourth Proportional to 260,818.20, 391,112.10 and 120,619.80

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Solution

The fourth proportional to 260,818.20, 391,112.10 and 120,619.80 is: 180,876.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,818.20 : 391,112.10 = 120,619.80 : x
  2. Step 2: Convert to fraction form
    260,818.20/391,112.10 = 120,619.80/x
  3. Step 3: Cross multiply
    260,818.20x = 391,112.10 × 120,619.80
  4. Step 4: Simplify right side
    260,818.20x = 47,175,863,279.58
  5. Step 5: Solve for x
    x = 47,175,863,279.58/260,818.20
  6. Step 6: Final answer
    x = 180,876.42

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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.