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Finding the Third Proportional to 618.75 and 667.13

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Solution

The third proportional to 618.75 and 667.13 is: 719.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    618.75 : 667.13 = 667.13 : x
  2. Step 2: Convert to fraction form
    618.75/667.13 = 667.13/x
  3. Step 3: Cross multiply
    618.75x = 667.13 × 667.13
  4. Step 4: Simplify right side
    618.75x = 445,055.77
  5. Step 5: Solve for x
    x = 445,055.77/618.75
  6. Step 6: Final answer
    x = 719.28

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.