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Finding the Third Proportional to 309.25 and 400.88

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Solution

The third proportional to 309.25 and 400.88 is: 519.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    309.25 : 400.88 = 400.88 : x
  2. Step 2: Convert to fraction form
    309.25/400.88 = 400.88/x
  3. Step 3: Cross multiply
    309.25x = 400.88 × 400.88
  4. Step 4: Simplify right side
    309.25x = 160,700.77
  5. Step 5: Solve for x
    x = 160,700.77/309.25
  6. Step 6: Final answer
    x = 519.65

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Why These Related Problems?

These problems maintain the same ratio (1.30) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.