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Finding the Third Proportional to 690 and 753

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Solution

The third proportional to 690 and 753 is: 821.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    690 : 753 = 753 : x
  2. Step 2: Convert to fraction form
    690/753 = 753/x
  3. Step 3: Cross multiply
    690x = 753 × 753
  4. Step 4: Simplify right side
    690x = 567,009
  5. Step 5: Solve for x
    x = 567,009/690
  6. Step 6: Final answer
    x = 821.75

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.