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Finding the Third Proportional to 308.63 and 657.19

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Solution

The third proportional to 308.63 and 657.19 is: 1,399.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.63 : 657.19 = 657.19 : x
  2. Step 2: Convert to fraction form
    308.63/657.19 = 657.19/x
  3. Step 3: Cross multiply
    308.63x = 657.19 × 657.19
  4. Step 4: Simplify right side
    308.63x = 431,895.41
  5. Step 5: Solve for x
    x = 431,895.41/308.63
  6. Step 6: Final answer
    x = 1,399.42

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.