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Finding the Third Proportional to 207 and 318.38

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Solution

The third proportional to 207 and 318.38 is: 489.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    207 : 318.38 = 318.38 : x
  2. Step 2: Convert to fraction form
    207/318.38 = 318.38/x
  3. Step 3: Cross multiply
    207x = 318.38 × 318.38
  4. Step 4: Simplify right side
    207x = 101,362.64
  5. Step 5: Solve for x
    x = 101,362.64/207
  6. Step 6: Final answer
    x = 489.67

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Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.