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Finding the Third Proportional to 215.75 and 388.75

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Solution

The third proportional to 215.75 and 388.75 is: 700.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.75 : 388.75 = 388.75 : x
  2. Step 2: Convert to fraction form
    215.75/388.75 = 388.75/x
  3. Step 3: Cross multiply
    215.75x = 388.75 × 388.75
  4. Step 4: Simplify right side
    215.75x = 151,126.56
  5. Step 5: Solve for x
    x = 151,126.56/215.75
  6. Step 6: Final answer
    x = 700.47

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Why These Related Problems?

These problems maintain the same ratio (1.80) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.