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Finding the Third Proportional to 428.63 and 641.25

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Solution

The third proportional to 428.63 and 641.25 is: 959.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.63 : 641.25 = 641.25 : x
  2. Step 2: Convert to fraction form
    428.63/641.25 = 641.25/x
  3. Step 3: Cross multiply
    428.63x = 641.25 × 641.25
  4. Step 4: Simplify right side
    428.63x = 411,201.56
  5. Step 5: Solve for x
    x = 411,201.56/428.63
  6. Step 6: Final answer
    x = 959.35

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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.