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Finding the Third Proportional to 518.75 and 779.75

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Solution

The third proportional to 518.75 and 779.75 is: 1,172.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    518.75 : 779.75 = 779.75 : x
  2. Step 2: Convert to fraction form
    518.75/779.75 = 779.75/x
  3. Step 3: Cross multiply
    518.75x = 779.75 × 779.75
  4. Step 4: Simplify right side
    518.75x = 608,010.06
  5. Step 5: Solve for x
    x = 608,010.06/518.75
  6. Step 6: Final answer
    x = 1,172.07

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.