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Finding the Third Proportional to 678 and 979.50

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Solution

The third proportional to 678 and 979.50 is: 1,415.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    678 : 979.50 = 979.50 : x
  2. Step 2: Convert to fraction form
    678/979.50 = 979.50/x
  3. Step 3: Cross multiply
    678x = 979.50 × 979.50
  4. Step 4: Simplify right side
    678x = 959,420.25
  5. Step 5: Solve for x
    x = 959,420.25/678
  6. Step 6: Final answer
    x = 1,415.07

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Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.