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Finding the Third Proportional to 691 and 752

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Solution

The third proportional to 691 and 752 is: 818.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    691 : 752 = 752 : x
  2. Step 2: Convert to fraction form
    691/752 = 752/x
  3. Step 3: Cross multiply
    691x = 752 × 752
  4. Step 4: Simplify right side
    691x = 565,504
  5. Step 5: Solve for x
    x = 565,504/691
  6. Step 6: Final answer
    x = 818.38

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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.