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Finding the Third Proportional to 618.50 and 917.75

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Solution

The third proportional to 618.50 and 917.75 is: 1,361.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.50 : 917.75 = 917.75 : x
  2. Step 2: Convert to fraction form
    618.50/917.75 = 917.75/x
  3. Step 3: Cross multiply
    618.50x = 917.75 × 917.75
  4. Step 4: Simplify right side
    618.50x = 842,265.06
  5. Step 5: Solve for x
    x = 842,265.06/618.50
  6. Step 6: Final answer
    x = 1,361.79

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.