Home / 919,685.78-1,379,736.28-280,046.72

Finding the Fourth Proportional to 919,685.78, 1,379,736.28 and 280,046.72

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Solution

The fourth proportional to 919,685.78, 1,379,736.28 and 280,046.72 is: 420,133.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    919,685.78 : 1,379,736.28 = 280,046.72 : x
  2. Step 2: Convert to fraction form
    919,685.78/1,379,736.28 = 280,046.72/x
  3. Step 3: Cross multiply
    919,685.78x = 1,379,736.28 × 280,046.72
  4. Step 4: Simplify right side
    919,685.78x = 386,390,611,380.09
  5. Step 5: Solve for x
    x = 386,390,611,380.09/919,685.78
  6. Step 6: Final answer
    x = 420,133.29

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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.