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Finding the Fourth Proportional to 260,039.80, 389,768.10 and 133,631.20

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Solution

The fourth proportional to 260,039.80, 389,768.10 and 133,631.20 is: 200,296.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    260,039.80 : 389,768.10 = 133,631.20 : x
  2. Step 2: Convert to fraction form
    260,039.80/389,768.10 = 133,631.20/x
  3. Step 3: Cross multiply
    260,039.80x = 389,768.10 × 133,631.20
  4. Step 4: Simplify right side
    260,039.80x = 52,085,178,924.72
  5. Step 5: Solve for x
    x = 52,085,178,924.72/260,039.80
  6. Step 6: Final answer
    x = 200,296.95

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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.