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Finding the Third Proportional to 679.78 and 913.78

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Solution

The third proportional to 679.78 and 913.78 is: 1,228.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    679.78 : 913.78 = 913.78 : x
  2. Step 2: Convert to fraction form
    679.78/913.78 = 913.78/x
  3. Step 3: Cross multiply
    679.78x = 913.78 × 913.78
  4. Step 4: Simplify right side
    679.78x = 834,996.17
  5. Step 5: Solve for x
    x = 834,996.17/679.78
  6. Step 6: Final answer
    x = 1,228.33

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.