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Finding the Fourth Proportional to 1,420,129.28, 1,959,794 and 775,568.44

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Solution

The fourth proportional to 1,420,129.28, 1,959,794 and 775,568.44 is: 1,070,292.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420,129.28 : 1,959,794 = 775,568.44 : x
  2. Step 2: Convert to fraction form
    1,420,129.28/1,959,794 = 775,568.44/x
  3. Step 3: Cross multiply
    1,420,129.28x = 1,959,794 × 775,568.44
  4. Step 4: Simplify right side
    1,420,129.28x = 1,519,954,375,301.36
  5. Step 5: Solve for x
    x = 1,519,954,375,301.36/1,420,129.28
  6. Step 6: Final answer
    x = 1,070,292.96

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.