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Finding the Fourth Proportional to 275,128.20, 412,692.30 and 212,920.20

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Solution

The fourth proportional to 275,128.20, 412,692.30 and 212,920.20 is: 319,380.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,128.20 : 412,692.30 = 212,920.20 : x
  2. Step 2: Convert to fraction form
    275,128.20/412,692.30 = 212,920.20/x
  3. Step 3: Cross multiply
    275,128.20x = 412,692.30 × 212,920.20
  4. Step 4: Simplify right side
    275,128.20x = 87,870,527,054.46
  5. Step 5: Solve for x
    x = 87,870,527,054.46/275,128.20
  6. Step 6: Final answer
    x = 319,380.30

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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.