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Finding the Third Proportional to 386.75 and 578.75

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Solution

The third proportional to 386.75 and 578.75 is: 866.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.75 : 578.75 = 578.75 : x
  2. Step 2: Convert to fraction form
    386.75/578.75 = 578.75/x
  3. Step 3: Cross multiply
    386.75x = 578.75 × 578.75
  4. Step 4: Simplify right side
    386.75x = 334,951.56
  5. Step 5: Solve for x
    x = 334,951.56/386.75
  6. Step 6: Final answer
    x = 866.07

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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.