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Finding the Fourth Proportional to 1,279,384.40, 1,917,847.80 and 994,917.20

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Solution

The fourth proportional to 1,279,384.40, 1,917,847.80 and 994,917.20 is: 1,491,420.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279,384.40 : 1,917,847.80 = 994,917.20 : x
  2. Step 2: Convert to fraction form
    1,279,384.40/1,917,847.80 = 994,917.20/x
  3. Step 3: Cross multiply
    1,279,384.40x = 1,917,847.80 × 994,917.20
  4. Step 4: Simplify right side
    1,279,384.40x = 1,908,099,763,202.16
  5. Step 5: Solve for x
    x = 1,908,099,763,202.16/1,279,384.40
  6. Step 6: Final answer
    x = 1,491,420.22

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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.