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Finding the Third Proportional to 315.50 and 669.25

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Solution

The third proportional to 315.50 and 669.25 is: 1,419.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    315.50 : 669.25 = 669.25 : x
  2. Step 2: Convert to fraction form
    315.50/669.25 = 669.25/x
  3. Step 3: Cross multiply
    315.50x = 669.25 × 669.25
  4. Step 4: Simplify right side
    315.50x = 447,895.56
  5. Step 5: Solve for x
    x = 447,895.56/315.50
  6. Step 6: Final answer
    x = 1,419.64

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Why These Related Problems?

These problems maintain the same ratio (2.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.