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Finding the Third Proportional to 399.66 and 757.55

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Solution

The third proportional to 399.66 and 757.55 is: 1,435.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.66 : 757.55 = 757.55 : x
  2. Step 2: Convert to fraction form
    399.66/757.55 = 757.55/x
  3. Step 3: Cross multiply
    399.66x = 757.55 × 757.55
  4. Step 4: Simplify right side
    399.66x = 573,877.27
  5. Step 5: Solve for x
    x = 573,877.27/399.66
  6. Step 6: Final answer
    x = 1,435.93

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Why These Related Problems?

These problems maintain the same ratio (1.90) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.