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Finding the Fourth Proportional to 1,279.94, 1,766.25 and 783.41

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Solution

The fourth proportional to 1,279.94, 1,766.25 and 783.41 is: 1,081.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,279.94 : 1,766.25 = 783.41 : x
  2. Step 2: Convert to fraction form
    1,279.94/1,766.25 = 783.41/x
  3. Step 3: Cross multiply
    1,279.94x = 1,766.25 × 783.41
  4. Step 4: Simplify right side
    1,279.94x = 1,383,689.08
  5. Step 5: Solve for x
    x = 1,383,689.08/1,279.94
  6. Step 6: Final answer
    x = 1,081.06

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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.