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Finding the Third Proportional to 257.50 and 438.25

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Solution

The third proportional to 257.50 and 438.25 is: 745.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.50 : 438.25 = 438.25 : x
  2. Step 2: Convert to fraction form
    257.50/438.25 = 438.25/x
  3. Step 3: Cross multiply
    257.50x = 438.25 × 438.25
  4. Step 4: Simplify right side
    257.50x = 192,063.06
  5. Step 5: Solve for x
    x = 192,063.06/257.50
  6. Step 6: Final answer
    x = 745.88

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Why These Related Problems?

These problems maintain the same ratio (1.70) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.