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Finding the Third Proportional to 372.09 and 428.91

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Solution

The third proportional to 372.09 and 428.91 is: 494.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    372.09 : 428.91 = 428.91 : x
  2. Step 2: Convert to fraction form
    372.09/428.91 = 428.91/x
  3. Step 3: Cross multiply
    372.09x = 428.91 × 428.91
  4. Step 4: Simplify right side
    372.09x = 183,960.57
  5. Step 5: Solve for x
    x = 183,960.57/372.09
  6. Step 6: Final answer
    x = 494.39

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.