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Finding the Third Proportional to 505.50 and 778.75

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Solution

The third proportional to 505.50 and 778.75 is: 1,199.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    505.50 : 778.75 = 778.75 : x
  2. Step 2: Convert to fraction form
    505.50/778.75 = 778.75/x
  3. Step 3: Cross multiply
    505.50x = 778.75 × 778.75
  4. Step 4: Simplify right side
    505.50x = 606,451.56
  5. Step 5: Solve for x
    x = 606,451.56/505.50
  6. Step 6: Final answer
    x = 1,199.71

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.