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Finding the Third Proportional to 207.75 and 315.19

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Solution

The third proportional to 207.75 and 315.19 is: 478.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    207.75 : 315.19 = 315.19 : x
  2. Step 2: Convert to fraction form
    207.75/315.19 = 315.19/x
  3. Step 3: Cross multiply
    207.75x = 315.19 × 315.19
  4. Step 4: Simplify right side
    207.75x = 99,343.16
  5. Step 5: Solve for x
    x = 99,343.16/207.75
  6. Step 6: Final answer
    x = 478.19

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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.