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Finding the Fourth Proportional to 1,280,899.28, 1,921,557.72 and 394,435.28

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Solution

The fourth proportional to 1,280,899.28, 1,921,557.72 and 394,435.28 is: 591,717.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280,899.28 : 1,921,557.72 = 394,435.28 : x
  2. Step 2: Convert to fraction form
    1,280,899.28/1,921,557.72 = 394,435.28/x
  3. Step 3: Cross multiply
    1,280,899.28x = 1,921,557.72 × 394,435.28
  4. Step 4: Simplify right side
    1,280,899.28x = 757,930,157,324.36
  5. Step 5: Solve for x
    x = 757,930,157,324.36/1,280,899.28
  6. Step 6: Final answer
    x = 591,717.22

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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.