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Finding the Fourth Proportional to 778.23, 1,161.65 and 685.97

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Solution

The fourth proportional to 778.23, 1,161.65 and 685.97 is: 1,023.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.23 : 1,161.65 = 685.97 : x
  2. Step 2: Convert to fraction form
    778.23/1,161.65 = 685.97/x
  3. Step 3: Cross multiply
    778.23x = 1,161.65 × 685.97
  4. Step 4: Simplify right side
    778.23x = 796,847.81
  5. Step 5: Solve for x
    x = 796,847.81/778.23
  6. Step 6: Final answer
    x = 1,023.92

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.