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Finding the Third Proportional to 421 and 756

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Solution

The third proportional to 421 and 756 is: 1,357.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    421 : 756 = 756 : x
  2. Step 2: Convert to fraction form
    421/756 = 756/x
  3. Step 3: Cross multiply
    421x = 756 × 756
  4. Step 4: Simplify right side
    421x = 571,536
  5. Step 5: Solve for x
    x = 571,536/421
  6. Step 6: Final answer
    x = 1,357.57

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Why These Related Problems?

These problems maintain the same ratio (1.80) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.