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Finding the Third Proportional to 399.38 and 624.38

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Solution

The third proportional to 399.38 and 624.38 is: 976.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.38 : 624.38 = 624.38 : x
  2. Step 2: Convert to fraction form
    399.38/624.38 = 624.38/x
  3. Step 3: Cross multiply
    399.38x = 624.38 × 624.38
  4. Step 4: Simplify right side
    399.38x = 389,844.14
  5. Step 5: Solve for x
    x = 389,844.14/399.38
  6. Step 6: Final answer
    x = 976.14

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.