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Finding the Third Proportional to 678.38 and 1,120.50

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Solution

The third proportional to 678.38 and 1,120.50 is: 1,850.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    678.38 : 1,120.50 = 1,120.50 : x
  2. Step 2: Convert to fraction form
    678.38/1,120.50 = 1,120.50/x
  3. Step 3: Cross multiply
    678.38x = 1,120.50 × 1,120.50
  4. Step 4: Simplify right side
    678.38x = 1,255,520.25
  5. Step 5: Solve for x
    x = 1,255,520.25/678.38
  6. Step 6: Final answer
    x = 1,850.78

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Why These Related Problems?

These problems maintain the same ratio (1.65) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.