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Finding the Third Proportional to 427.78 and 663.19

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Solution

The third proportional to 427.78 and 663.19 is: 1,028.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    427.78 : 663.19 = 663.19 : x
  2. Step 2: Convert to fraction form
    427.78/663.19 = 663.19/x
  3. Step 3: Cross multiply
    427.78x = 663.19 × 663.19
  4. Step 4: Simplify right side
    427.78x = 439,817.66
  5. Step 5: Solve for x
    x = 439,817.66/427.78
  6. Step 6: Final answer
    x = 1,028.14

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.