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Finding the Third Proportional to 318.66 and 669.56

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Solution

The third proportional to 318.66 and 669.56 is: 1,406.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    318.66 : 669.56 = 669.56 : x
  2. Step 2: Convert to fraction form
    318.66/669.56 = 669.56/x
  3. Step 3: Cross multiply
    318.66x = 669.56 × 669.56
  4. Step 4: Simplify right side
    318.66x = 448,313.94
  5. Step 5: Solve for x
    x = 448,313.94/318.66
  6. Step 6: Final answer
    x = 1,406.89

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Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.