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Finding the Third Proportional to 561 and 612.75

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Solution

The third proportional to 561 and 612.75 is: 669.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    561 : 612.75 = 612.75 : x
  2. Step 2: Convert to fraction form
    561/612.75 = 612.75/x
  3. Step 3: Cross multiply
    561x = 612.75 × 612.75
  4. Step 4: Simplify right side
    561x = 375,462.56
  5. Step 5: Solve for x
    x = 375,462.56/561
  6. Step 6: Final answer
    x = 669.27

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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.