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Finding the Third Proportional to 252.50 and 398.50

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Solution

The third proportional to 252.50 and 398.50 is: 628.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.50 : 398.50 = 398.50 : x
  2. Step 2: Convert to fraction form
    252.50/398.50 = 398.50/x
  3. Step 3: Cross multiply
    252.50x = 398.50 × 398.50
  4. Step 4: Simplify right side
    252.50x = 158,802.25
  5. Step 5: Solve for x
    x = 158,802.25/252.50
  6. Step 6: Final answer
    x = 628.92

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Why These Related Problems?

These problems maintain the same ratio (1.58) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.