Home / 1,280,509.90-1,920,912.47-427,694.71

Finding the Fourth Proportional to 1,280,509.90, 1,920,912.47 and 427,694.71

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Solution

The fourth proportional to 1,280,509.90, 1,920,912.47 and 427,694.71 is: 641,591.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280,509.90 : 1,920,912.47 = 427,694.71 : x
  2. Step 2: Convert to fraction form
    1,280,509.90/1,920,912.47 = 427,694.71/x
  3. Step 3: Cross multiply
    1,280,509.90x = 1,920,912.47 × 427,694.71
  4. Step 4: Simplify right side
    1,280,509.90x = 821,564,101,792.03
  5. Step 5: Solve for x
    x = 821,564,101,792.03/1,280,509.90
  6. Step 6: Final answer
    x = 641,591.37

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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.