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Finding the Third Proportional to 429.47 and 643.92

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Solution

The third proportional to 429.47 and 643.92 is: 965.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    429.47 : 643.92 = 643.92 : x
  2. Step 2: Convert to fraction form
    429.47/643.92 = 643.92/x
  3. Step 3: Cross multiply
    429.47x = 643.92 × 643.92
  4. Step 4: Simplify right side
    429.47x = 414,635.38
  5. Step 5: Solve for x
    x = 414,635.38/429.47
  6. Step 6: Final answer
    x = 965.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.