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Finding the Third Proportional to 421 and 658

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Solution

The third proportional to 421 and 658 is: 1,028.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    421 : 658 = 658 : x
  2. Step 2: Convert to fraction form
    421/658 = 658/x
  3. Step 3: Cross multiply
    421x = 658 × 658
  4. Step 4: Simplify right side
    421x = 432,964
  5. Step 5: Solve for x
    x = 432,964/421
  6. Step 6: Final answer
    x = 1,028.42

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.