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Finding the Third Proportional to 258.75 and 385.50

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Solution

The third proportional to 258.75 and 385.50 is: 574.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    258.75 : 385.50 = 385.50 : x
  2. Step 2: Convert to fraction form
    258.75/385.50 = 385.50/x
  3. Step 3: Cross multiply
    258.75x = 385.50 × 385.50
  4. Step 4: Simplify right side
    258.75x = 148,610.25
  5. Step 5: Solve for x
    x = 148,610.25/258.75
  6. Step 6: Final answer
    x = 574.34

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.