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Finding the Third Proportional to 427.75 and 688.38

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Solution

The third proportional to 427.75 and 688.38 is: 1,107.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.75 : 688.38 = 688.38 : x
  2. Step 2: Convert to fraction form
    427.75/688.38 = 688.38/x
  3. Step 3: Cross multiply
    427.75x = 688.38 × 688.38
  4. Step 4: Simplify right side
    427.75x = 473,860.14
  5. Step 5: Solve for x
    x = 473,860.14/427.75
  6. Step 6: Final answer
    x = 1,107.80

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.