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Finding the Third Proportional to 407.75 and 561.75

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Solution

The third proportional to 407.75 and 561.75 is: 773.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    407.75 : 561.75 = 561.75 : x
  2. Step 2: Convert to fraction form
    407.75/561.75 = 561.75/x
  3. Step 3: Cross multiply
    407.75x = 561.75 × 561.75
  4. Step 4: Simplify right side
    407.75x = 315,563.06
  5. Step 5: Solve for x
    x = 315,563.06/407.75
  6. Step 6: Final answer
    x = 773.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.