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Finding the Third Proportional to 399.88 and 606.38

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Solution

The third proportional to 399.88 and 606.38 is: 919.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.88 : 606.38 = 606.38 : x
  2. Step 2: Convert to fraction form
    399.88/606.38 = 606.38/x
  3. Step 3: Cross multiply
    399.88x = 606.38 × 606.38
  4. Step 4: Simplify right side
    399.88x = 367,690.64
  5. Step 5: Solve for x
    x = 367,690.64/399.88
  6. Step 6: Final answer
    x = 919.51

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Why These Related Problems?

These problems maintain the same ratio (1.52) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.