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Finding the Third Proportional to 424.25 and 521.75

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Solution

The third proportional to 424.25 and 521.75 is: 641.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    424.25 : 521.75 = 521.75 : x
  2. Step 2: Convert to fraction form
    424.25/521.75 = 521.75/x
  3. Step 3: Cross multiply
    424.25x = 521.75 × 521.75
  4. Step 4: Simplify right side
    424.25x = 272,223.06
  5. Step 5: Solve for x
    x = 272,223.06/424.25
  6. Step 6: Final answer
    x = 641.66

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Why These Related Problems?

These problems maintain the same ratio (1.23) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.