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Finding the Third Proportional to 677.75 and 969.25

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Solution

The third proportional to 677.75 and 969.25 is: 1,386.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    677.75 : 969.25 = 969.25 : x
  2. Step 2: Convert to fraction form
    677.75/969.25 = 969.25/x
  3. Step 3: Cross multiply
    677.75x = 969.25 × 969.25
  4. Step 4: Simplify right side
    677.75x = 939,445.56
  5. Step 5: Solve for x
    x = 939,445.56/677.75
  6. Step 6: Final answer
    x = 1,386.12

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.