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Finding the Third Proportional to 391 and 695

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Solution

The third proportional to 391 and 695 is: 1,235.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    391 : 695 = 695 : x
  2. Step 2: Convert to fraction form
    391/695 = 695/x
  3. Step 3: Cross multiply
    391x = 695 × 695
  4. Step 4: Simplify right side
    391x = 483,025
  5. Step 5: Solve for x
    x = 483,025/391
  6. Step 6: Final answer
    x = 1,235.36

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Why These Related Problems?

These problems maintain the same ratio (1.78) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.