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Finding the Third Proportional to 642.75 and 756.75

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Solution

The third proportional to 642.75 and 756.75 is: 890.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.75 : 756.75 = 756.75 : x
  2. Step 2: Convert to fraction form
    642.75/756.75 = 756.75/x
  3. Step 3: Cross multiply
    642.75x = 756.75 × 756.75
  4. Step 4: Simplify right side
    642.75x = 572,670.56
  5. Step 5: Solve for x
    x = 572,670.56/642.75
  6. Step 6: Final answer
    x = 890.97

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.