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Finding the Third Proportional to 429.75 and 694.13

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Solution

The third proportional to 429.75 and 694.13 is: 1,121.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.75 : 694.13 = 694.13 : x
  2. Step 2: Convert to fraction form
    429.75/694.13 = 694.13/x
  3. Step 3: Cross multiply
    429.75x = 694.13 × 694.13
  4. Step 4: Simplify right side
    429.75x = 481,809.52
  5. Step 5: Solve for x
    x = 481,809.52/429.75
  6. Step 6: Final answer
    x = 1,121.14

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Why These Related Problems?

These problems maintain the same ratio (1.62) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.