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Finding the Third Proportional to 778.36 and 1,678.22

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Solution

The third proportional to 778.36 and 1,678.22 is: 3,618.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    778.36 : 1,678.22 = 1,678.22 : x
  2. Step 2: Convert to fraction form
    778.36/1,678.22 = 1,678.22/x
  3. Step 3: Cross multiply
    778.36x = 1,678.22 × 1,678.22
  4. Step 4: Simplify right side
    778.36x = 2,816,418.17
  5. Step 5: Solve for x
    x = 2,816,418.17/778.36
  6. Step 6: Final answer
    x = 3,618.40

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.