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Finding the Fourth Proportional to 259,940.80, 389,911.20 and 82,461.70

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Solution

The fourth proportional to 259,940.80, 389,911.20 and 82,461.70 is: 123,692.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,940.80 : 389,911.20 = 82,461.70 : x
  2. Step 2: Convert to fraction form
    259,940.80/389,911.20 = 82,461.70/x
  3. Step 3: Cross multiply
    259,940.80x = 389,911.20 × 82,461.70
  4. Step 4: Simplify right side
    259,940.80x = 32,152,740,401.04
  5. Step 5: Solve for x
    x = 32,152,740,401.04/259,940.80
  6. Step 6: Final answer
    x = 123,692.55

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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.