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Finding the Third Proportional to 255.50 and 407.25

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Solution

The third proportional to 255.50 and 407.25 is: 649.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.50 : 407.25 = 407.25 : x
  2. Step 2: Convert to fraction form
    255.50/407.25 = 407.25/x
  3. Step 3: Cross multiply
    255.50x = 407.25 × 407.25
  4. Step 4: Simplify right side
    255.50x = 165,852.56
  5. Step 5: Solve for x
    x = 165,852.56/255.50
  6. Step 6: Final answer
    x = 649.13

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.