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Finding the Fourth Proportional to 778.91, 1,168.56 and 680.49

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Solution

The fourth proportional to 778.91, 1,168.56 and 680.49 is: 1,020.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.91 : 1,168.56 = 680.49 : x
  2. Step 2: Convert to fraction form
    778.91/1,168.56 = 680.49/x
  3. Step 3: Cross multiply
    778.91x = 1,168.56 × 680.49
  4. Step 4: Simplify right side
    778.91x = 795,193.39
  5. Step 5: Solve for x
    x = 795,193.39/778.91
  6. Step 6: Final answer
    x = 1,020.91

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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.