Home / 1,280.26-1,767.30-783.09

Finding the Fourth Proportional to 1,280.26, 1,767.30 and 783.09

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Solution

The fourth proportional to 1,280.26, 1,767.30 and 783.09 is: 1,081.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,280.26 : 1,767.30 = 783.09 : x
  2. Step 2: Convert to fraction form
    1,280.26/1,767.30 = 783.09/x
  3. Step 3: Cross multiply
    1,280.26x = 1,767.30 × 783.09
  4. Step 4: Simplify right side
    1,280.26x = 1,383,954.96
  5. Step 5: Solve for x
    x = 1,383,954.96/1,280.26
  6. Step 6: Final answer
    x = 1,081.00

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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.