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Finding the Fourth Proportional to 275,009.80, 412,821.90 and 256,961.80

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Solution

The fourth proportional to 275,009.80, 412,821.90 and 256,961.80 is: 385,729.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    275,009.80 : 412,821.90 = 256,961.80 : x
  2. Step 2: Convert to fraction form
    275,009.80/412,821.90 = 256,961.80/x
  3. Step 3: Cross multiply
    275,009.80x = 412,821.90 × 256,961.80
  4. Step 4: Simplify right side
    275,009.80x = 106,079,458,503.42
  5. Step 5: Solve for x
    x = 106,079,458,503.42/275,009.80
  6. Step 6: Final answer
    x = 385,729.74

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1.5x scale

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.